Nonlinear tribological behavior of polymeric microparticles under extreme collision conditions is required for an in-depth understanding of advanced applications in the fields of defense, biomedicine, and manufacturing. Laser-induced projectile impact tests with an incidence angle of 45° are conducted to investigate the tribological response at the contact interface of block copolymers with glassy–rubbery phases and a stationary substrate to induce deformations with an ultrahigh strain rate. Morphological-phase-dependent tribological and rheological responses are quantified from the mechanical interactions involving adiabatic heating, plastic flow, and interfacial shear instability. An effective coefficient of friction mechanism that depends on the rheological transition activated by impact velocity is proposed to specify the rheological response of the copolymers.

中文翻译：

---

动态流变不稳定性诱导共聚物的极端摩擦学特性

聚合物微粒在极端碰撞条件下的非线性摩擦学行为需要深入了解国防、生物医学和制造领域的先进应用。进行了入射角为 45° 的激光诱导弹丸冲击试验，以研究具有玻璃-橡胶相的嵌段共聚物和固定基底的接触界面处的摩擦学响应，以诱导超高应变率变形。依赖于形态相的摩擦学和流变学响应通过涉及绝热加热、塑性流动和界面剪切不稳定性的机械相互作用进行量化。