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Category: Creep and Relaxation

 

Creep Deformation of Polymers by Nanoindentation

Creep deformation often occurs due to the lack of alertness of the time-dependent creep behavior of the polymer materials used under specific service conditions. As a result, it is important to develop a reliable and quantitative test of the viscoelastic mechanical behaviors of the polymers. Nanoindentation using the Nanovea Mechanical Tester applies the load by a high-precision piezo and directly measures the evolution of force and displacement in situ. The combination of accuracy and repeatability makes it an ideal tool for creep measurement.

Creep Deformation of Polymers by Nanoindentation

Stress Relaxation Measurement With Nanoindentation

As per ASTM E 328, Standard Test Methods for Stress Relaxation for Materials and Structures, external force is initially applied on the material or structure to reach a constant constraint, and then the change in the external force necessary to maintain this constraint is measured as a function of time. The major difficulty in the stress relaxation test is maintaining the constant constraint. The nanoindentation module of Nanovea Mechanical Tester accurately measures the stress relaxation by applying the close loop control of the load with ultra-sensitive load cell and piezo. The piezo reacts real-time to keep the constraint constant while the change in load is measured and recorded by the high precision load cell. This measurement can be performed on virtually all types of materials without the stringent requirement of sample dimension. Multiple stress relaxation tests can be performed on the same flat sample to ensure the test repeatability, which substantially reduces the cost on sample manufacturing and machining.

https://nanovea.com/App-Notes/stress-relaxation-measurement.pdf

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MICRO-NANO Technology Co. Ltd

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160-0023

株式会社日本サーマル・コンサルティング

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Мелитэк | Melytec LLC

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Moscow, 117342, Russia
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