Fracture mechanism of polymer under high strain rate loading is still today a complicated issue in developing their design as protection structure. In this paper, we aim to investigate the crack arrest capability of RTPMMA when subjected to impact loading. For that purpose, Kalthoff and Winkler (KW)-like impact tests are performed using the STIMPACT platform gas launchers. Double notched specimens were impacted on the edge within a range of impact velocities (50-140 m/s). During the investigation, the failure mechanism is recorded by a high speed camera. The stress whitening phenomena is explained and it is shown that addition of rubber to PMMA matrix aids to enhance its impact toughness. This involves energy dissipation by the rubber and higher energy required for crack propagation in rubber toughened RT-PMMA as compared in neat PMMA. High impact velocities promote greater effect proved by large number of fragments produced aftermath. By carrying out uniaxial tensile tests, it was established that the mechanical behaviour of RT-PMMA strongly depends on strain rate and temperature.
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机译：高应变速率负荷下聚合物的断裂机制仍然是发展设计作为保护结构的复杂问题。在本文中，我们的目标是在受冲击载荷时调查RTPMMA的裂缝阻毒能力。为此目的，使用锡斯普特平台气体发射器进行Kalthoff和Winkler（KW）的冲击试验。双缺口样本受到冲击速度范围内的边缘（50-140 m / s）。在调查过程中，失效机制由高速相机记录。解释了应力美化现象，并表明将橡胶添加到PMMA基质助剂中以增强其冲击韧性。这涉及橡胶和橡胶增韧RT-PMMA中裂纹繁殖所需的橡胶和更高能量的能量耗散，而在整洁的PMMA中相比，耐橡胶增韧RT-PMMA。高冲击速度促进了大量碎片所产生的更大效果。通过进行单轴拉伸试验，确定RT-PMMA的力学行为强烈取决于应变速率和温度。
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