Spec Sheet_Anti-Vibration Enclosure_DJ2_AN1-8-7-23.docx

Specification Sheet For Anti-Vibration Workstation and Enclosure

Background The National Institute of Standards and Technology (NIST) Engineering Laboratory (EL) Materials and Structural Systems Division (MSSD) studies the durability and service life of infrastructure materials (polymer, concrete, engineered composites) for resilience infrastructure applications. Resilience refers to the ability of a material or system to resist and recover from damage or stress. In the context of infrastructure materials, such as those used in buildings, bridges, and roads, resilience is an important property that ensures that these structures can withstand the demands of their intended use and continue to function in the face of changing environmental and operational conditions. For example, concrete is a commonly used infrastructure material that must be resilient to a range of environmental and operational stresses. Concrete is a brittle material that is susceptible to cracking and fracture under certain conditions, such as when exposed to freezing and thawing cycles or heavy loads. To improve the resilience of concrete, various additives and reinforcements can be incorporated to enhance its strength, toughness, and resistance to environmental degradation.

Microindentation is a technique used to measure the mechanical properties of materials at small length scales. It involves pressing a hard indenter (typically a diamond tip) into the surface of a material, and measuring the resulting indentation depth and/or indentation load. There are several types of measurements that can be done using microindentation:

· Hardness: This is the resistance of a material to deformation. The most commonly used hardness measurements are Vickers, Knoop, and Rockwell hardness.

· Young's modulus: This is a measure of the stiffness of a material. It is calculated by measuring the indentation depth and the load, and using these values to calculate the material's elasticity.

· Creep: This is the tendency of a material to deform over time when subjected to a constant load. Measuring creep in concrete can provide valuable information about the long-term behavior of these structures and help ensure their safety and durability.

· Residual stress: This is the stress that remains in a material after it has been subjected to external stresses. Microindentation can be used to measure residual stresses by indenting a material in multiple locations and measuring the resulting indentation depths.

· Fracture toughness: This can be indirectly measured through empirical relations that have been developed. One such relation is the Berkovich formula, which relates the indentation crack length to the fracture toughness of the material.

When the indenter tip contacts the sample surface, it creates a small deformation or indentation. This deformation is very small, typically on the order of nanometers, and it is sensitive to any external disturbances or vibrations. Vibrations can cause the sample or indenter to move during the indentation process, leading to an inaccurate indentation depth or load measurement. Even small vibrations, such as those from nearby equipment or foot traffic, can have a significant impact on the measurement accuracy. In addition, vibrations can also damage the sample surface or the indenter tip, leading to further measurement errors.

Purpose The purpose of this acquisition is to procure an anti-vibration table and enclosure. To minimize vibrations during indentation measurements, it is important to conduct the measurement in a quiet and stable environment, away from sources of external disturbance. The instrument should also be designed with vibration isolation features, such as vibration damping materials or isolation feet, to reduce the effects of external vibrations. Overall, minimizing vibrations during indentation measurements is essential for obtaining accurate and reliable mechanical property data from materials, and it is critical for ensuring the validity and reproducibility of experimental results. The initial purchase did not include the enclosure and anti-vibration table because NIST was not aware of the significant sources of vibration in the laboratory space available.

Description of Required Product The antivibration table and enclosure will minimize these external vibrations.

The contractor shall provide a solution to minimize vibration that negatively impacts the indentation measurement. This solution shall meet or exceeds the following minimum technical requirements and specifications:

The specifications for the anti-vibration table are listed below:

· Load Capacity: 1,000 Lbs

· Isolation Technology: Piezoelectric sensors, actuators, and control electronics

· Force Directions: Active vibration isolation in all six degrees of freedom

· Required Floor Flatness: 2 millimeters per meter

· Isolation Characteristics: Dynamic 1 Hz to 200 Hz, Passive beyond 200 Hz

· Transmissibility: Above 10 Hz transmissibility <0.017 decreasing rapidly

· Correction Forces: Maximum 4N horizontally, 8N vertically

· System Noise: Less than 50nG/√Hz from 0.1 - 200Hz in any direction

· Static Compliance at Indenter: Less than 3.5μm/N vertically and 7μm/N horizontally

Warranty Requirements The Contractor shall provide, at a minimum, a one-year warranty for the equipment. The warranty shall cover all parts, labor, and travel. The warranty shall commence upon successful completion of delivery, installation, and training.

Delivery Requirements Delivery shall be made F.O.B. Destination within 120 days after Contractor receipt of order to the National Institute of Standards and Technology at the address identified below.

National Institute of Standards and Technology (NIST) 100 Bureau Drive Building 206 Gaithersburg, MD 20899-0001

FOB Destination means: The contractor shall pack and mark the shipment in conformance with carrier requirements, deliver the shipment in good order and condition to the point of delivery specified in the purchase order, be responsible for any loss of and/or damage to the goods occurring before receipt and acceptance of the shipment by the consignee at the delivery point specified in the purchase order; and pay all charges to the specified point of delivery.

Note: The NIST Gaithersburg, MD campus is a controlled-access facility. Deliveries are only accepted when arranged in advance. The Contractor shall request approval of delivery time with the NIST subject matter expert (SME) in advance of shipment.

Contractor failure to confirm delivery method and procedures and to receive SME approval prior to shipment shall release the Government of any liability and may result in payment being withheld until the item can be received and physically inspected.

Installation Requirements The Contractor shall provide installation for the antivibration table and enclosure. Installation shall include, at a minimum, uncrating/unpacking of all equipment, set-up and hook-up of all equipment, start-up, demonstration of specifications, and removal of all trash. Contractor access to the NIST campus shall be scheduled in advance with the SME. Contractor staff will be escorted by NIST staff during installation.

Training Requirements The Contractor shall schedule and facilitate training for up to 5 persons – in person training in addition to up to 5 people via webcam on-line training at NIST Gaithersburg. The training shall provide a thorough demonstration of all equipment functions, equipment operation, and basic troubleshooting. The training may be completed on-site at NIST immediately after installation.

Inspection & Acceptance NIST will inspect delivered products within ten (10) business days after delivery to ensure that they conform to the requirements identified in this Statement of Need. Testing after start-up will consist of demonstration of the individual instrument components and their appropriate use and performance. Evaluation/acceptance after installation will occur by NIST staff after the vendor demonstrates the instrument meets all the vendor specifications in the Gaithersburg, MD laboratory. If all requirements are met and the equipment is operational, the product shall be accepted.

NIST Campus Security NIST is a restricted campus. The contractor shall provide the name and citizenship information of the delivery, installation, and training technician(s) to the NIST SME at least five business days prior to arrival at the NIST Gaithersburg campus. The SME will submit the name and citizenship information to the NIST Office of Security in order for the Contractor to enter the NIST Gaithersburg campus to perform delivery, installation, and training.

The Contractor is also responsible for providing appropriate identification at the NIST Security Office to obtain access to campus. Delivery trucks must arrive via Gate C. To access the campus separately from deliveries by car, the Contractor must register their vehicle(s) with the NIST Security Office upon arrival. A valid driver’s license or Government-furnished civilian ID, as well as proof of insurance and current vehicle registration must be presented to the NIST Security Office, at which time a NIST vehicle pass will be issued. The pass shall be displayed on the vehicle in accordance with NIST Security Office instructions. Valid identification, such as a driver’s license or passport, is required for access, for entry into buildings, and is shown to the armed Security Police when entering the NIST Gaithersburg campus.

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