Demiral Murat, Mamedov Ali
College of Engineering and Technology, American University of the Middle East, Egaila 54200, Kuwait.
Polymers (Basel). 2023 Apr 19;15(8):1949. doi: 10.3390/polym15081949.
In many technical domains, adhesively bonded joints have been employed extensively. These joints perform poorly against peel stresses despite having good shear characteristics. A step-lap joint (SLJ) is one of the techniques used to reduce the peel stresses at the edges of the overlap area to avoid damages. In these joints, the butted laminations of each layer are successively offset in succeeding layers in the same direction. Bonded joints are subjected to cyclic loadings in addition to static loads. It is difficult to predict their fatigue life accurately; however, this information must be clarified to explain their failure characteristics. To this end, the fatigue response of an adhesively bonded step-lap joint subjected to tensile loading was investigated with the developed finite-element (FE) model. In the joint, toughened type DP 460 and A2024-T3 aluminium alloys were used for the adhesive layer and adherends, respectively. The cohesive zone model with static and fatigue damages were linked to each other and were used to represent the response of the adhesive layer. The model was implemented using an ABAQUS/Standard user-defined UMAT subroutine. Experiments found in the literature served as a basis for validating the numerical model. The fatigue performance of a step-lap joint for various configurations subjected to tensile loading was examined thoroughly.
在许多技术领域，粘结接头已被广泛应用。尽管这些接头具有良好的剪切特性，但在承受剥离应力时性能较差。阶梯搭接接头（SLJ）是用于降低搭接区域边缘的剥离应力以避免损坏的技术之一。在这些接头中，每层对接的叠片在后续层中沿相同方向依次偏移。粘结接头除了承受静载外，还承受循环载荷。准确预测其疲劳寿命很困难；然而，必须明确此信息以解释其失效特性。为此，利用所开发的有限元（FE）模型研究了承受拉伸载荷的粘结阶梯搭接接头的疲劳响应。在该接头中，增韧型DP 460和A2024-T3铝合金分别用于粘结层和被粘物。将具有静态和疲劳损伤的粘结区模型相互关联，并用于表示粘结层的响应。该模型使用ABAQUS/Standard用户定义的UMAT子程序实现。文献中发现的实验作为验证数值模型的基础。对承受拉伸载荷的各种构型的阶梯搭接接头的疲劳性能进行了全面研究。
