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首页> 外文期刊>Journal of Applied Polymer Science >PRECRACK HYSTERESIS ENERGY IN DETERMINING POLYCARBONATE DUCTILE-BRITTLE TRANSITION .4. EFFECT OF STRAIN RATE
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PRECRACK HYSTERESIS ENERGY IN DETERMINING POLYCARBONATE DUCTILE-BRITTLE TRANSITION .4. EFFECT OF STRAIN RATE

机译：确定碳酸盐化合物脆性-脆性转变时的裂纹前滞回能.4。应变率的影响

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摘要

Effect of deformation rate on the ductile-brittle transition behavior for polycarbonate (PC) with different molar mass, notch radius, and rubber content has been investigated. PC with higher molar mass, notch radius, or rubber-modification possesses a higher critical strain rate when the ductile-brittle transition occurs. Whether a notched specimen will fail in a ductile mode or a brittle mode is already decided before the onset of the crack initiation. If size of the precrack plastic zone exceeds a critical level prior to onset of crack initiation, the crack extension developed later will propagate within the plastic zone and result in a ductile mode fracture. The precrack elastic storage energy, the input energy subtracting the hysteresis energy, is the main driving force to strain the crack tip for crack initiation. The precrack hysteresis energy (directly related to the precrack plasticity) increases with the decrease of the applied strain rate. Therefore, the strain rate is also closely related to the size of the precrack plastic zone. If the strain rate is lower than the critical strain rate, the specimen is able to grow a precrack plastic zone exceeding the critical plastic zone and results in a ductile mode fracture. (C) 1997 John Wiley & Sons, Inc. [References: 15]
机译：研究了变形速率对不同摩尔质量，缺口半径和橡胶含量的聚碳酸酯（PC）的韧性-脆性转变行为的影响。当发生韧性-脆性转变时，具有较高摩尔质量，缺口半径或橡胶改性的PC具有较高的临界应变率。在开始裂纹之前，已经确定了缺口试样是在延性模式还是在脆性模式下失效。如果裂纹开始前裂纹前塑料区的大小超过了临界水平，则随后产生的裂纹扩展将在塑料区内传播，并导致延性断裂。裂纹前的弹性存储能量（输入能量减去磁滞能量）是使裂纹尖端应变以引发裂纹的主要驱动力。裂纹前的滞后能量（与裂纹前的可塑性直接相关）随施加应变率的降低而增加。因此，应变率也与裂纹前塑料区的大小密切相关。如果应变率低于临界应变率，则样品能够生长出超过临界塑性区的裂纹前塑性区，并导致延性断裂。 （C）1997 John Wiley＆Sons，Inc. [参考：15]

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