13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- 6. Conclusion Recently, high-speed tensile test is being used as a standard testing method to evaluate impact strength of the materials. For polymeric material, the strain rate and dynamic stress concentration is (A) Dynamic stress distribution when the maximum dynamic stress appeared (b) Strain rate distribution when the maximum strain rate appeared ① ② ③ ① ② ③ Figure 9. Stress and strain rate distribution around minimum section of ρ=0.03 mm 0 500 1000 1500 2000 Dynamic stress σ y (t) [MPa] 0 100 200 300 400 500 600 Strain rate ε y (t) [s -1 ] (A) Dynamic stress distribution when the maximum dynamic stress appeared (b) Strain rate distribution when the maximum strain rate appeared 0 100 200 300 Strain rate ε y (t) [s -1 ] 0 200 400 600 800 Dynamic stress σ y (t) [MPa] ① ② ③ ① ② ③ Figure 10. Stress and strain rate distribution around minimum section of ρ=0.2mm
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