N0016721Q01530001_AMEND.docx

N0016721Q0153

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

SECTION SF 1449 - CONTINUATION SHEET

SOLICITATION/CONTRACT FORM

The required response date/time has changed from 09-Sep-2021 11:00 AM to 24-Nov-2021 11:00 AM.

SUPPLIES OR SERVICES AND PRICES

CLIN 0001

The CLIN description has changed from Rising Displacement/K Test to Rising Displacement/K Test - N/A.

The CLIN extended description has changed from:

Perform testing in accordance with the statement of work (SOW).

To:

REMOVED FROM SOW

The pricing detail quantity has decreased by 80.00 from 80.00 to 0.00.

The minimum quantity has decreased by 10.00 from 10.00 to 0.00.

The maximum quantity has decreased by 80.00 from 80.00 to 0.00.

The PSC code R425 has been deleted.

The NAICS code 541330 has been deleted.

CLIN 0002

The CLIN description has changed from Constant Stress Intensity Test to Constant Stress Intensity Test - N/A.

The CLIN extended description has changed from:

Perform testing in accordance with the SOW.

REMOVED FROM SOW

The pricing detail quantity has decreased by 36.00 from 36.00 to 0.00.

The minimum quantity has decreased by 5.00 from 5.00 to 0.00.

The maximum quantity has decreased by 36.00 from 36.00 to 0.00.

The PSC code R425 has been deleted.

The NAICS code 541330 has been deleted.

CLIN 0003

The pricing detail quantity has decreased by 20.00 from 40.00 to 20.00.

The maximum quantity has decreased by 20.00 from 40.00 to 20.00.

CLIN 0004

The pricing detail quantity has decreased by 150.00 from 500.00 to 350.00.

The minimum quantity has changed from UNDEFINED to 200.00.

The maximum quantity has decreased by 150.00 from 500.00 to 350.00.

CLIN 0005

The pricing detail quantity has decreased by 250.00 from 500.00 to 250.00.

The minimum quantity has changed from UNDEFINED to 100.00.

The maximum quantity has decreased by 250.00 from 500.00 to 250.00.

CLIN 0006

The pricing detail quantity has decreased by 100.00 from 200.00 to 100.00.

The minimum quantity has changed from UNDEFINED to 25.00.

The maximum quantity has decreased by 100.00 from 200.00 to 100.00.

CLIN 0007

The pricing detail quantity has increased by 50.00 from 200.00 to 250.00.

The maximum quantity has increased by 50.00 from 200.00 to 250.00.

CLIN 0008

The pricing detail quantity has decreased by 256.00 from 506.00 to 250.00.

The maximum quantity has decreased by 256.00 from 506.00 to 250.00.

CLIN 0009

The pricing detail quantity has decreased by 256.00 from 506.00 to 250.00.

The maximum quantity has decreased by 256.00 from 506.00 to 250.00.

CLIN 0010

The IDC type has changed from N/A to Indefinite Quantity.

The CLIN type priced has been deleted.

The FOB Destination has been deleted.

INSPECTION AND ACCEPTANCE

The Acceptance/Inspection Schedule for CLIN 0010 has been changed from:

The following have been modified:

STATEMENT OF WORK

STATEMENT OF WORK (SOW)

Mechanical and Environmental Cracking Testing Services for Aluminum Coupons Rev. 8

1.0 Scope

NSWCCD Code 612 is assisting the Unmanned Maritime Systems (UMS) Program Office, PMS 406, to analyze the properties of forgings produced from aluminum alloys 7175-T74 and 6061-T6. Mechanical properties must be determined in air to validate that forging properties are within program specifications. Environmental fracture performance must also be evaluated in representative forgings to inform component service life. Only sparse fracture properties data for saltwater exposure are available in literature because these materials are typically used for aerospace and ground transportation applications. These experimental results are urgently needed to inform ongoing design analyses and risk assessments.

2.0 Background

The primary objective of this contract is to determine the mechanical properties of various 7175-T74 and 6061-T6 forgings in air, as well as to determine the fracture properties in saltwater using standard test methods. The most critical material performance parameter to be determined is the “threshold stress intensity factor (K) for environmentally assisted crack growth”, referred to herein as KI-EAC. Data are also needed that quantify environmentally assisted crack growth rates (referred to as da/dt) that occur in seawater once K exceeds KI-EAC.

Environmental fracture testing and standard mechanical testing may be performed as defined in Table 1 by the prime Contractor or a subcontractor with proven capability to conduct the same.

Table 1. Test types and quantities for Contractor testing services

Compact Tension, C(T) Type D (deadload test)

Tension Testing

ASTM E8

Compression Testing

ASTM E9

Elastic Modulus

ASTM E111

compact tension, C(T) Type B (J-integral test)

precrack C(T) specimens in fatigue

max. qty at the limit of all C(T) samples

The product delivered must be within the specified test specimen ranges presented in Table 1.

3.0 Applicable Documents

The following specifications and standards form a part of this contract to the extent specified herein. The version of the specification or standard shall be the most recent version issued at the time of contract award, unless otherwise specified.

In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3.1 ASTM E 8/E8M, Standard Test Methods for Tension Testing of Metallic Materials

3.2 ASTM E9, Standard Test Methods of Compression Testing of Metallic Materials at Room Temperature

3.3 ASTM E83, Standard Practice for Verification and Classification of Extensometer Systems

3.4 ASTM E111, Standard Test Method for Young’s Modulus, Tangent Modulus, and Chord Modulus

3.5 ASTM E340, Standard Practice for Macroetching Metals and Alloys

3.6 ASTM E399, Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness KIC of Metallic Materials

3.7 ASTM E647, Standard Test Method for Measurement of Fatigue Crack Growth Rates

3.8 ASTM E1681, Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials

3.9 ASTM E1820, Standard Test Method for Measurement of Fracture Toughness

3.10 ISO/IEC 17025, General Requirements for the Competence of Testing and Calibration Laboratories

3.11 NIST Technical Note 1679, “Repeatability and reproducibility of compression strength measurements conducted according to ASTM E9”, Sep 2009

4.0 General Requirements

4.1 Contractor’s Progress, Status and Management Report

The Contractor shall provide a monthly status report. The report shall include a summary of work completed, work schedule status, planned work for the next month, problem areas with proposed solutions, funding expended (current period and cumulative), and remaining balance. The monthly status report shall include input from the prime Contractor as well as all associated sub-Contractors as applicable. (CDRL A001)

4.2 Test Laboratory Certification

The Contractor, and Sub-Contractors as applicable, shall be responsible for maintaining NADCAP certification A2LA to ISO/IEC 17025, and/or alternative certifications as approved by the Government, for all services provided as part of this contract for the full contract period of performance.

4.3 The term “Contractor” denotes the prime and all subcontractors, except where otherwise specified.

5.0 Testing of Machined Specimens

5.1 General Testing Requirements

5.1.1 The Contractor shall conduct testing of machined specimens as specified in the Task Orders issued by NSWCCD, with quantities for Contractor testing as provided by Table 1. The testing shall be conducted according to the requirements of Section 6.0 and the Task Orders.

5.1.2 The Contractor shall notify the Government via e-mail when recalibration/recertification of test equipment used in the performance of the contract occurs.

5.1.3 The Contractor shall be responsible for initiating mechanical testing within five (5) business days of the date that the Contractor receives the samples, unless another timeframe has been approved by the Government prior to the shipment of samples, and shall deliver the report/s within ten (10) business days of test completion.

5.2 Specimen Pre-cracking and Side-Groove Machining

5.2.1 Specimens requiring a pre-crack prior to mechanical testing will be identified in the Task Orders. The Contractor shall prepare each test specimen as required by pre-cracking the starter notch in fatigue. This process may be conducted in ambient air. The Contractor shall precrack in accordance with parameters provided in the Task Order for each specimen.

5.2.2 Specimens requiring side-grooves prior to mechanical testing will be specified in the Task Orders. The Contractor shall machine side-grooves into the specimens as required after completion of pre-cracking, with dimensions as specified in the Task Order for each specimen.

5.3 Detailed Testing Requirements

5.3.1 Tensile Testing (ASTM E8/E8M, ASTM E83)

5.3.1.1 The Contractor shall perform quasi-static tensile testing in accordance with ASTM E8/E8M.

5.3.1.2 The Contractor shall operate the testing machine in crosshead control with constant speed when determining yield properties, that is, “Method A” as described in ASTM E8/E8M-16a Section 7.6.4.1.

5.3.1.3 After yield behavior and strain of at least 5% have been recorded, the rate of testing may be increased in accordance with ASTM E8/E8M-16a Section 7.6.5.

5.3.1.4 The Contractor shall use an extensometer of Class B-2 or better for extension measurement (see ASTM E83-16), and at least 5% strain is required. The recording of strain until the maximum load is preferred.

5.3.1.5 The test temperature for tensile specimens shall be room temperature, unless otherwise specified by Task Order.

5.3.1.6 The Contractor shall handle fracture surfaces of broken specimens so as to prevent oxidation or other surface damage, and preserve by a light coat of lacquer that is soluble in a common solvent (e.g. acetone or ethanol) shortly after the completion of testing.

5.3.2 Compression Testing (ASTM E9, ASTM E111, ASTM E83, NIST Technical Note 1679)

5.3.2.1 The Contractor shall conduct compressive strength tests in accordance with requirements of ASTM E9 for displacement control (or “crosshead” control). The crosshead speed shall be set to achieve a strain rate in the elastic portion no greater than 0.005-inch/inch per minute.

5.3.2.2 The Contractor shall conduct compressive strength tests at constant crosshead speed until a total axial strain of at least 3.0% is reached.

5.3.2.3 The Contractor shall use contact extensometers of Class B-2 or better (see ASTM E83-16) s for determination of yield properties, per ASTM E9-09 Section 6.5.

5.3.2.4 Per ASTM E9-09 Section 9.2, if the modulus of elasticity (i.e. Young’s Modulus) is the primary quantity to be determined, the Contractor shall follow the test method of ASTM E111, including the use of Class B-1 or better contact extensometers. The need to determine the modulus of elasticity as the primary test quantity will be specified in the Task Order.

5.3.2.5 The Contractor shall position the attachment points of the extensometer(s) at distance of approximately one specimen diameter away from each end of the specimen. For example, the minimum length of a 0.5-inch diameter test specimen would be 2inches, when using a 1-inch extensometer. For a 0.25-inch diameter sample, the minimum specimen length would be 1.0-inch when using a 0.5-inch extensometer.

5.3.2.6 The Contractor shall measure sample diameter and length with an accuracy of +/- 0.001-in., both before and after the compression test. The final engineering strain should be compared to the final strain recorded by the extensometer during the test. Initial and final geometries shall be recorded and any discrepancies between measured strain and extensometer strain shall be reported.

5.3.2.7 The test temperature for compression specimens will be at room temperature, unless otherwise specified by Task Order.

5.3.2.8 The Contractor shall use molybdenum disulfide or similar lubricant on the ends of the samples to reduce friction and potential for barreling effects.

5.3.2.9 The Contractor shall measure and verify that the bearing surfaces are parallel within 0.0002-inch/inch prior to the start of testing for each test frame used (See ASTM E9-09 paragraph 6.1.1.).

5.3.2.10 The Contractor shall use two extensometers of the appropriate class, positioned diametrically opposed, for all Elastic Modulus tests. The use of two diametrically opposed extensometers provides the most consistent strain measurement and elastic modulus.

5.3.3 In-air Fracture Toughness Test (ASTM E1820)

5.3.3.1 The Contractor shall test compact tension specimens at a quasi-static rate according to the requirements of ASTM E1820. The specimen quantities, identification codes, and orientations will be specified by the Task Order.

5.3.3.2 The Contractor shall perform and record all measurements and calculations required by Section 10 of ASTM E1820-17.

5.3.3.3 The test temperature will be specified by the Task Order. It is anticipated that most tests will be conducted at room temperature, although some tests may include temperature as low as 28F.

5.3.3.4 The Contractor shall ensure that pre-cracking and side-grooving has been accomplished per the Task Order, prior to conduct of fracture toughness testing per ASTM E1820.

5.3.3.5 The Contractor shall protect all specimen fracture surfaces from oxidation or other forms of physical damage, and return post-test samples to the Government if requested.

5.3.4 Threshold Testing for Environmentally Assisted Crack Growth (ASTM E1681)

5.3.4.1 The Contractor shall test compact tension specimens to determine the threshold stress intensity factor for environmentally assisted cracking according to the procedure of ASTM E1681 for aluminum. The specimen quantities, identification codes, and orientations will be specified by the Task Order.

5.3.4.2 The Contractor shall conduct testing with all specimens immersed in synthetic seawater or 3.5% saltwater solution for a continuous period of 10,000 hours, per Section 8.4 of ASTM E1681-03 (2013). Testing shall be conducted at room temperature with solution pH maintained between 8.1 and 8.3 during testing. Cathodic potentials for testing shall include -0.85 volts versus saturated calomel electrode (VSCE) and -1.05 VSCE. Other requirements for environmental conditions, including temperature, pH, and cathodic potential, will be specified in the Task Order.

5.3.4.3 Testing shall include a minimum of two applied K values below the expected threshold value, one applied K value equivalent to the anticipated threshold value, and two applied K values above the expected threshold value, unless otherwise specified by the Task Order.

5.3.4.4 Each applied K level shall include a minimum of 4 test specimen replicates, unless otherwise specified by the Task Order.

5.3.4.5 The Contractor shall conduct testing using a dead load. Loading methods including fixed displacement or bolt loading are prohibited.

5.3.4.6 The Contractor shall measure crack growth using either a direct current potential difference (dcPD) system or strain gauging throughout each ASTM E1681 test, achieving a minimum crack length measurement resolution of 0.01 inch or greater resolution.

5.3.4.7 The Contractor shall record all values and calculations as required by Section 10 of ASTM E1681-03 (2013).

6.0 Reporting of Materials Characterization Tests

6.1 General Reporting Requirements

6.1.1 The Contractor shall submit a report (CDRL A002) summarizing test results from each of the required materials characterization tests. Reports shall comply with requirements contained in the applicable test specification and shall include sufficient detail so that readers can understand what test(s) was/were performed; key testing parameters utilized; issues encountered during testing, if any; corrective measures taken, if any; and results obtained.

6.1.2 The Contractor shall submit the raw data for all materials characterization tests to the Government as part of the testing reporting requirement (CDRL A003). The Contractor may submit the raw data within the testing summary report (see Section 6.1.1), as an appendix to the testing summary report (see Section 6.1.1), or as a separate deliverable (for example, document, spreadsheet, CD).

6.1.3 The Contractor shall submit the materials characterization test reports (see Section 6.1.1) and raw data (see Section 6.1.2) to the Government no later than 14 calendar days after completion of testing unless otherwise agreed to by the Government.

6.2 Detailed Reporting Requirements

6.2.1 Tensile Test Results (ASTM E8)

6.2.1.1 The Contractor shall report the following information from each tensile test to the Government in accordance with CDRL A002 and CDRL A003:

· 0.2% offset yield strength, which shall be determined by the method described in ASTM E8-16 Section 7.7.1.

· Ultimate tensile strength.

· Original gauge length, percent elongation, and reduction of area as determined by ASTM E8-16 Section 7.11.

· Location of fracture, if applicable.

· Stress-strain diagram.

· Raw stress-strain data pairs and sensor measurements in tabular format (including elapsed time, load, displacement, and strain).

6.2.2 Compression and Modulus of Elasticity Test Results (ASTM E9/ASTM E111)

6.2.2.1 The Contractor shall report the following information from each compression test to the Government in accordance with CDRL A002 and A003:

· Modulus of elasticity, which shall be calculated as described in ASTM E111-04 (Reapproved 2010) Section 9.2.

· 0.2% offset yield strength, which shall be determined by the method described in ASTM E9-09 (Reapproved 2018) Section 9.3.

· Compressive strength at 2.0% axial strain, as described in ASTM E09-09 (Reapproved 2018) Section 9.5.

· Stress-strain diagram.

· Raw stress-strain data pairs and sensor measurements in tabular format (including elapsed time, load, displacement, and strain).

6.2.3 In-air Fracture Toughness Test (ASTM E1820)

6.2.3.1 The Contractor shall record a photographic image of each fracture surface, suitable for visual identification of the pre-crack length and the final extent of crack propagation. The Contractor shall provide a final test report including results for all tests, recorded data, and fracture surface photographs in accordance with CDRL A002 and A003. Results shall include all applicable values and measurements listed in Section 10 of ASTM E1820-17.

6.2.4 Threshold Testing for Environmentally Assisted Crack Growth (ASTM E1681)

6.2.4.1 During testing, the Contractor shall use strain gauging or dcPD to collect crack growth data.

6.2.4.2 Following testing, the Contractor shall determine, record, and report the pre-crack length and final extent of crack propagation through direct examination of the fracture surface. The Contractor may mark the extent of cracking by fatigue cycling prior to separating the specimen, if necessary.

6.2.4.3 The Contractor shall record a photographic image of each fracture surface, suitable for visual identification of the pre-crack length and the final extent of crack propagation if possible. The Contractor shall obtain high magnification images for at least one specimen at every applied K-level via scanning electron microscopy (SEM) or other method suitable to identify the occurrence of EAC.

6.2.4.4 The Contractor shall provide a final test report including results for all tests, recorded data, and fracture surface photographs in accordance with CDRL A002 and A003. Test results shall include the pass/fail status of each specimen, any measured crack growth rates for failed specimens, as well as all other requirements of Section 10 of ASTM E1681-03 (2013).

7.0 Government Furnished Information/Property (GFI/GFP)

7.1 GFI

· The Government will provide drawings of the test specimens at Contract Award.

· NIST Technical Note 1679 (Section 6.3.2.8)

7.2 GFP

The Government will provide all machined test specimens (without pre-cracking or side grooving) to the Contractor at Contract Award, or following receipt and inspection of materials by the Government. It is anticipated that material will be available no earlier than December 2021.

8.0 Return of GFI/GFP

The Contractor shall be responsible for shipping excess material and all tested specimens back to the Government at the Contractor’s expense within fourteen (14) calendar days of completion of testing, or as otherwise agreed to by the Government. (CDRL A004)

9.0 Deliverables

9.1 CDRL A001 – Monthly Status Report

9.2 CDRL A002 – Monthly Test Results Report

9.3 CDRL A003 – Monthly Raw Data Report

9.4 CDRL A004 – Government Furnished Property

10.0 Security

All work under this contract is Unclassified. All GFI/GFP, drawings and test data are to be designated as “Controlled Unclassified Information – Distribution Statement D”.

10.1 Any Contractor reports involving work under this contract produced for independent publication must be submitted to NSWCCD and approved by the Government for public release.

11.0 Enterprise-Wide Contractor Manpower Reporting Application (ECMRA)

N/A

12.0 Place of Performance

The place of performance for all tasking will be principally ON-SITE (at the Contractor’s or sub-Contractor’s facility). Travel by the Contractor is not anticipated for the performance of this tasking. The Government reserves the right to witness testing as determined necessary and/or in the best interest of the Government.

13.0 Period of Performance

The Period of Performance is from December 2021 through December 2023.

All shipments of materials per Section 9.0 shall be addressed as follows:

NAVAL SURFACE WARFARE CENTER, Carderock Division 9500 MacArthur Boulevard West Bethesda, MD 20817-5700 Attn: TO BE DETERMINED, Code XXX

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