The material is polycarbonate! It is important to set the fracture strain considering the strain rate dependence!
We would like to introduce a case study analyzing the fracture of the notched Charpy test (JIS K7111-1/1eA). A total of 10 tests were conducted, resulting in 9 hinge fractures, with a Charpy impact strength of 77 (kJ/m³). From the results of the impact strength and the behavior of the fractures, it can be said that in order to analyze the notched Charpy impact test, it is important to establish not only the "stress-strain" relationship considering strain rate dependence but also the fracture strain considering strain rate dependence. 【Case Overview】 ■ Material: Polycarbonate ■ Material Model: Resin Material Constitutive Law SAMP-1 ■ High-speed tensile tests were conducted to determine the following (1) and (2): ・(1) "Stress-Strain" relationship considering strain rate dependence ・(2) Fracture strain considering strain rate dependence *For more details, please refer to the related links or feel free to contact us.
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【Results】 ■Impact Strength ・Case (a): Results are almost the same as the test results ・Case (b): Overestimated ・Case (c): Underestimated ■Destruction Observations ・Cases (a) and (c): Hinge destruction was successfully reproduced ・Case (b): Cracks did not progress sufficiently, resulting in the hammer being pushed back in the opposite direction *For more details, please refer to the related links or feel free to contact us.
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