A new method for determining mode-II fracture toughness of composite curved laminates

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-08-17 DOI:10.1016/j.tafmec.2025.105178

Yu Gong , Yuting Gao , Hexiang Zhang , Jian Zhao , Ning Hu

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引用次数: 0

Abstract

Composite curved laminates are commonly used in various engineering fields, accurate determination of their fracture toughness is important. In this work, a new and simple method for determining mode-II fracture toughness of composite curved laminates is proposed. Engesser-Castigliano theorem and unit load method are applied to derive the formula for mode-II fracture toughness of composite curved laminates, and the formula is verified by test and simulation results. ENF tests are carried out on two kinds of composite curved laminates with unidirectional and orthogonal stacking sequences, and different radii. It is found that the initial slopes of experimental load–displacement curves are in good agreements with theoretical results. In addition, finite element model is established by using cohesive zone model for delamination simulation, and the fracture toughness obtained from the developed method is input of the finite element model. The predicted load–displacement curve agrees well with test results, further verifying the applicability of the developed method for determining fracture toughness of curved laminates. One advantage of this method is that the mode-II fracture toughness can be determined without crack observation.

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一种确定复合材料弯曲层合板ii型断裂韧性的新方法

复合弯曲层压板广泛应用于各种工程领域，其断裂韧性的准确测定具有重要意义。本文提出了一种新的、简便的复合材料弯曲层合板ii型断裂韧性测定方法。应用Engesser-Castigliano定理和单位载荷法推导了复合材料弯曲层合板ii型断裂韧性计算公式，并通过试验和仿真结果对公式进行了验证。对两种不同半径、单向和正交叠加顺序的复合材料弯曲层板进行了ENF试验。试验荷载-位移曲线的初始斜率与理论结果吻合较好。此外，采用内聚区模型建立有限元模型进行分层模拟，并将所得断裂韧性作为有限元模型的输入。预测的载荷-位移曲线与试验结果吻合较好，进一步验证了所建立的方法测定弯曲层合板断裂韧性的适用性。该方法的一个优点是可以在不观察裂纹的情况下确定ii型断裂韧性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.