Micromechanical model for off-axis creep rupture in unidirectional composites undergoing finite strains

被引：3

作者：

Kovacevic, Dragan ^{[1
,3
]}

Sundararajan, Bharath K. ^{[2
,3
]}

van der Meer, Frans P. ^{[1
]}

机构：

[1] Delft Univ Technol, Fac Civil Engn & Geosci, POB 5048, NL-2600 GA Delft, Netherlands

[2] Univ Twente, Fac Engn Technol, POB 217, NL-7522 LW Enschede, Netherlands

[3] Dutch Polymer Inst DPI, POB 902, NL-5600 AX Eindhoven, Netherlands

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2024年 / 176卷

关键词：

Thermoplastic composites; Cohesive zone modeling; Energy-based initiation; Homogenization; TIME-DEPENDENT FAILURE; POLYMER; FORMULATION; PLASTICITY; PREDICTION; DAMAGE;

D O I：

10.1016/j.compositesa.2023.107860

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A microscale numerical framework for modeling creep rupture in unidirectional composites under off-axis loading is presented, building on recent work on imposing off-axis loading on a representative volume element. Creep deformation of the thermoplastic polymer matrix is accounted for by means of the Eindhoven Glassy Polymer material model. Creep rupture is represented with cohesive cracks, combining an energy -based initiation criterion with a time-dependent cohesive law and a global failure criterion based on the minimum in homogenized creep strain-rate. The model is compared against experiments on carbon/PEEK composite material tested at different off-axis angles, stress levels and temperatures. Creep deformation is accurately reproduced by the model, except for small off-axis angles, where the observed difference is ascribed to macroscopic variations in the experiment. Trends in rupture time are also reproduced although quantitative rupture time predictions are not for all test cases accurate.

引用

页数：14

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