Comparison on mechanical properties, damage evolution and aging effects of multi-delaminated composites under three poin
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Comparison on mechanical properties, damage evolution and aging effects of multi‑delaminated composites under three point bending Reng Qin1,2 · Wei Zhou1,2 · Kang‑ning Han1,2 · Yan‑jing Zhang1,2 · Lian‑hua Ma1,2 Received: 16 March 2020 / Accepted: 24 August 2020 © Springer Nature Switzerland AG 2020
Abstract The study on natural aging of fiber reinforced composite, delamination damage behavior and damage pattern recognition plays a significant role in structural health monitoring of the material. In this study, acoustic emission is used to investigate damage evolution process and damage mechanisms in unidirectional glass and carbon-glass orthogonal woven fiber reinforced composites containing symmetric multiple delaminations under three point bending testing. Based on the principle of control variables, four kinds of specimens are manufactured to investigate the comparative study for the effects of delaminations, reinforced materials and fiber orientation on buckling failure behaviors and the effects of aging on mechanical properties. The results indicate that the degradation of strength and stiffness of composite can be influenced by the existence of delamination defects and natural aging condition. Both negative and positive effects can be generated by natural aging condition. Moreover, reinforced materials, porosity and fiber orientation are important factors influencing the reliability of composite. Clustering results of unidirectional fiber reinforced composites indicate interphase failure is the main damage component, moreover, the existence of symmetrical multiple delaminations will aggravate the damage of composite and make instability failure characterized by intermittency. Keywords Delamination · Acoustic emission · Mechanical property · Damage mechanism · Natural aging effect
1 Introduction Fiber reinforced polymer (FRP) composite has gained its reputation in the fields of automobile, aerospace and sports due to a series of good mechanical properties such as high specific strength and specific modulus, good design-ability and resistance to dynamic fatigue [1–3]. However, a lot of damages such as matrix cracking, delamination, fiber-matrix debonding and fiber breakage might appear during the manufacturing and service processes, among which delamination is the main form of destruction [4, 5]. Layered buckling is easy to occur in laminated composite plate structure at a low load level due to the existence of delamination, resulting in the expansion of
delamination as well as other damages and leading to the early occurrence of overall instability and failure of the structure. Moreover, FRP composite will be exposed to air, water, sunlight and other environments in processing, storage and application. Polymer is sensitive to these environmental factors and susceptible to aging due to the effects of these factors. Degradation will occur at the interface between matrix and fiber with the aging time extending, so that the natural aging of the composite also has a certain impact on its service. Therefore,
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