CAJ | 학술논문

在实验所得结果之基础上研究了预偏角对单搭接胶接接头破坏机制的影响,用弹塑性有限元法模型得到了不同裂纹长度时接头整体和胶层中心等效应力沿裂纹尖端的分布,并研究了外载大小、裂纹长度对应力强度因子的影响.结果表明,同轴接头和标准接头的破坏均从胶层界面开始,但同轴接头以形成较多小裂纹为主,而标准接头中裂纹沿着胶层向中部扩展,最终导致破坏;随裂纹长度的增加,接头上等效应力渐增,胶层中心峰值应力也增大,裂纹尖端的应力远高于其他部位;当裂纹扩展到临界尺寸时,接头会迅速破坏.
재실험소득결과지기출상연구료예편각대단탑접효접접두파배궤제적영향,용탄소성유한원법모형득도료불동렬문장도시접두정체화효층중심등효응력연렬문첨단적분포,병연구료외재대소、렬문장도대응력강도인자적영향.결과표명,동축접두화표준접두적파배균종효층계면개시,단동축접두이형성교다소렬문위주,이표준접두중렬문연착효층향중부확전,최종도치파배;수렬문장도적증가,접두상등효응력점증,효층중심봉치응력야증대,렬문첨단적응력원고우기타부위;당렬문확전도림계척촌시,접두회신속파배.
The effect of preformed angle on the fracture mechanism of both coaxial joint and off-axial joint paper is studied based on the test results.The effects of crack length in adhesive layer on the equivalent stress distributed in the midbondline and whole joints are investigated using an elastic-plastic finite element analysis (FEA).The effects of the crack length and the value of external load on the stress intensity factor are also studied.The results obtained show that the cracks all originated from the bondline interface in both coaxial and off-axial joint.A lot of small cracks form along the interface of the coaxial joint while the crack develops from the interface toward mid-bondline in the off-axial joint.The equivalent stress in whole joint and the mid-bondline increased when the cracks lengths and external load increase and the stress near the crack tip is much higher than that in the rest zone.The single lap joint fails when the crack length reaches to the critical size.