Fatigue resistance of polymer-based materials

本项目建议通过购买疲劳试验机来测量聚合物复合材料和泡沫的长期性能。通过疲劳测试，长时间的测量将用于预测与裂纹萌生和扩展相关的材料寿命终止特性，以全面了解与所施加载荷条件相关的所有类型的失效机制。该设备还可以测量材料的机械性能如何随时间变化，作为静态和动态负载，频率和振幅等参数的函数。结合光学和热测量，在长时间内获得的力学数据将大大提高我们对形态和温度的微小变化如何与应力-应变条件相关的理解，以获得样品的完整热机械历史。所要求的设备是一个模块化的实验装置，用于在小幅度和大幅度变形下进行疲劳测试。收集的所有信息将有助于设计工程师在复杂材料的质量控制和优化方面对复杂材料的特性进行建模。结果还将用于确定零件的寿命终止条件，以便提出更准确的更换和维护计划。所获得的结果将对加拿大的汽车、航空航天、先进/功能材料科学和工程、建筑和施工以及其制造工艺的设计/控制/优化等行业非常重要。最后，该设备将支持所有共同申请人当前和未来的研究计划，并可供所涉及的不同研究中心的成员使用：CREPEC（高性能聚合物和复合材料系统研究中心），CQMF（魁北克功能材料中心），CRMR（可再生材料研究中心），CRIB（混凝土结构研究中心）和REGAL（铝研究中心）。

This project proposes to measure the long term properties of polymer composites and foams by the acquisition of a fatigue tester. Through fatigue testing, measurements over long time periods will be used to predict the end of life properties of materials in relation with crack initiation and propagation to get a full picture of all types of failure mechanisms associated with the applied load conditions. The equipment can also measure how the mechanical properties of materials change with time as a function of several parameters like static and dynamic load, frequency and amplitude. Coupled with optical and thermal measurements, the mechanical data being obtained over long time periods will substantially enhance our understanding on how small changes in morphology and temperature are related to stress-strain conditions to get the full thermo-mechanical history of the samples. The equipment requested is a modular experimental setup to perform fatigue testing under small and large amplitude deformation. All the information gathered will help design engineers in modeling the properties of complex materials in terms of quality control and optimization of complex materials. The results will also be used to determine the end of life conditions of a part before failure to propose more accurate replacement and maintenance programmes. The results obtained will be highly important for Canadian industries like automotive, aerospace, advanced/functional material science and engineering, building and construction, as well as design/control/optimization of their manufacturing processes. Finally, the equipment will support the current and future research programmes of all the co-applicants, as well as being available for the members of the different research centers involved: CREPEC (Research Center for High Performance Polymer and Composite Systems), CQMF (Quebec Center on Functional Materials), CRMR (Research Center on Renewable Materials), CRIB (Research Center on Concrete Infrastructures) and REGAL (Research Center on Aluminium).