In-plane shear investigation of thermoplastic composites at high temperatures using bias extension test

This study investigates the in-plane shear behavior of thermoplastic composites using a bias extension test. Ensuring a uniform temperature distribution across the sample is critical for successful bias extension tests [1]. To address this, a new fixture was designed and manufactured to preheat the oven before sample placement and minimize the time required for the sample to reach the desired temperature. This also helps to ensure that the sample is not exposed to extreme temperature fluctuations. Several tests were conducted, including thermal tests, and thermo-mechanical bias extension experiments. The Digital Image Correlation (DIC) technique was used to capture local deformations and strains on the specimen's surface during the test. The results show a good agreement between the measurements and the theoretical assumptions of the bias extension test.