This paper presents and compares two combined experimental‐numerical techniques for the investigation of fracture properties of additively manufactured polymer parts using digital image correlation (DIC) measurements. The first method only uses measured kinematic fields, and the second is based on finite element simulations driven by measured boundary conditions. A mini single edge notched tensile sample manufactured by fused filament fabrication with ABS is studied. It is shown that both methods locally extract J‐integrals, and the crack tip is accurately located by the FE‐based method. By comparing computed displacements to those measured via DIC, it is possible to locally check the validity of the numerical model. The initiation and propagation stages are analyzed independently thanks to two different magnifications of acquired image series.

中文翻译：

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使用数字图像关联和有限元建模对增材制造的聚合物进行裂纹扩展测量和J积分评估

本文介绍并比较了使用数字图像相关（DIC）测量研究增材制造的聚合物零件的断裂性能的两种组合的实验数字技术。第一种方法仅使用测得的运动场，第二种方法基于由测得的边界条件驱动的有限元模拟。研究了用ABS熔丝制造的微型单边缺口拉伸样品。结果表明，两种方法均局部提取J进行积分，并通过基于有限元的方法精确地确定裂纹尖端。通过将计算出的位移与通过DIC测量的位移进行比较，可以局部检查数值模型的有效性。由于采集到的图像序列的两个不同的放大倍数，因此独立地分析了起始和传播阶段。