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Experimental and numerical qualification of morphology-property-correlations using the method of essential work of fracture (EWF) by the example of polymer blends

以聚合物共混物为例，使用断裂基本功 (EWF) 方法对形态-性质-相关性进行实验和数值鉴定

基本信息

批准号：
322212489
负责人：
Professor Dr.-Ing. Christian Bonten
金额：
--
依托单位：
Institut für Kunststofftechnik (IKT)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/322212489?language=en
关键词：
Experimental numerical qualification morphology property

项目摘要

The J-integral, the Crack-Tip-Opening-Displacement (CTOD), the energy release rate G and the method of the Essential Work of Fracture (EWF) are different methods to evaluate the fracture mechanical behavior of ductile materials. These methods are not suitable for dimensioning in design like the quasi-static tensile test, but are able to provide more accurate information in the case of local failure behavior. It is necessary to understand the local failure mechanisms to optimize materials. Their results offer also quantitative values, but can only be used for comparisons between different modified materials based on the same polymeric matrix. By varying the material modifications and/or morphology, which have an influence on the fracture behavior, materials can be optimized. From the applicants point of view, in particular the method of Essential Work of Fracture, is more appropriate and easy to use than the other methods and can be applied to neat polymers, polymer blends as well as particle and fiber reinforced polymers. Respectively, the simulation of the mechanical properties of materials at the atomic scale is not yet able to supply dimensioning parameters for the design, as the quasi-static tensile test does, but is pretty accurate at local inspections. The applicants regard this as useful to predict the Essential Work of Fracture and to optimize polymer blends for different applications. In this planned research project, the influence of different modifications on the investigated polymer blends will be determined with the method of Essential Work of Fracture. Simultaneously, the material modifications and the test method should be adjusted for the first time to make them predictable by means of molecular dynamics simulation.

J积分、裂纹尖端张开位移(CTOD)、能量释放率G和基本断裂功(EWF)是评价延性材料断裂力学行为的不同方法。这些方法不适合像准静态拉伸试验那样的设计尺寸，但能够在局部破坏行为的情况下提供更准确的信息。为了优化材料，有必要了解材料的局部破坏机理。他们的结果也提供了定量的值，但只能用于基于相同聚合物基质的不同改性材料之间的比较。通过改变对断裂行为有影响的材料改性和/或形态，可以优化材料。从申请人的角度来看，特别是基本断裂功的方法比其他方法更合适和更容易使用，可以应用于纯聚合物、聚合物共混物以及颗粒和纤维增强聚合物。此外，在原子尺度上对材料力学性能的模拟还不能像准静态拉伸试验那样为设计提供尺寸参数，但在局部检查中相当准确。申请人认为这对预测压裂的基本工作和为不同的应用优化聚合物混合物是有用的。在这个计划中的研究项目中，不同的改性对所研究的聚合物共混物的影响将用基本断裂功的方法来确定。同时，首次对材料的改性和测试方法进行调整，使其可以通过分子动力学模拟来预测。