AI 中文总结
研究增材制造聚合物TPMS晶格的损伤与断裂，通过系统实验开发新本构模型，将高保真粘塑性模型引入Abaqus，基于储存弹性能和等效塑性应变提出损伤准则，经实验验证后实现架构化聚合物结构的计算机辅助设计。
AI 中文摘要
架构化的三重周期极小曲面（TPMS）晶格具有卓越的比能量吸收、韧性、疲劳强度和可调性。虽然近期进展已建立速率相关的粘塑性本构模型来捕捉增材制造聚合物TPMS结构的复杂非线性变形响应，但预测断裂及由此导致的结构失效仍是重大挑战。我们通过对不同尺寸的单胞和晶格在拉伸、压缩及非单调载荷下进行系统实验来解决此问题。实验为开发捕捉聚合物TPMS晶格损伤和断裂行为的新本构模型提供依据。我们先将Ma等人（2026年）的高保真粘塑性变形本构模型通过用户材料子程序在有限元软件Abaqus/Explicit中实现。然后基于储存弹性能和等效塑性应变提出非晶态聚合物的损伤起始准则。损伤模型在Abaqus中使用Konale和Srivastava（2025年）的梯度损伤框架实现。利用非单调载荷下单胞和拉伸晶格的实验结果对损伤模型和数值模拟能力进行定量和定性验证。所提出的损伤模型和模拟能力实现了架构化聚合物结构的计算机辅助设计。
英文摘要
Architected triply periodic minimal surface (TPMS) lattices offer superior specific energy absorption, toughness, fatigue strength, and tunability. While recent advancements have established rate-dependent viscoplastic constitutive models to capture the complex nonlinear deformation response of additively manufactured polymeric TPMS structures, predicting fracture and the resulting structural failure remains a significant challenge. We address this by performing systematic experiments on unit cells and lattices of various sizes under tension, compression, and non-monotonic loading. The experiments inform the development of a new constitutive model that captures the damage and fracture behavior of polymeric TPMS lattices. We first implement a high-fidelity viscoplastic deformation constitutive model from Ma et al. (2026) into finite element software Abaqus/Explicit via a user material subroutine. We then propose a damage initiation criterion for amorphous polymers based on stored elastic energy and equivalent plastic strain. The damage model is implemented in Abaqus using gradient-damage framework following Konale and Srivastava(2025). The damage model and numerical simulation capability are quantitatively and qualitatively validated using experimental results for a unit cell under non-monotonic loading and lattices under tension. The proposed damage model and simulation capability enable in silico design of architected polymer structures.
