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Strain localization and crack formation effects on stress-strain response of ductile iron

机译:应变局部化和裂纹形成对球墨铸铁应力应变响应的影响

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The strain localization and crack formation in ferritic-pearlitic ductile iron under tension was investigated by in-situ tensile tests. In-situ tensile tests under optical microscope were performed and the onset of the early ferrite-graphite decohesions and micro-cracks inside the matrix were studied. The results revealed that early ferrite-graphite decohesion and micro-cracks inside the ferrite were formed at the stress range of 280-330 MPa, where a kink occurred in the stress-strain response, suggesting the dissipation of energy in both plastic deformation and crack initiation. Some micro-cracks initiated and propagated inside the ferrite but were arrested within the ferrite zone before propagating in the pearlite. Digital Image Correlation (DIC) was used to measure local strains in the deformed micrographs obtained from the in-situ tensile test Higher strain localization in the micro-structure was measured for the areas in which the early ferrite-graphite decohesions occurred or the micro-cracks initiated.%In-situ tensile test; Digital image correlation; Micro-crack; Graphite-matrix decohesion; Cracking
机译:通过原位拉伸试验研究了铁素体-球墨铸铁在拉伸下的应变局部化和裂纹形成。进行了光学显微镜下的原位拉伸试验,研究了基体内部早期铁素体-石墨脱粘和微裂纹的发生。结果表明,在280-330 MPa的应力范围内,形成了早期的铁素体-石墨脱附和微裂纹,应力-应变响应中出现了扭结,表明塑性变形和裂纹中的能量耗散。引发。一些微裂纹在铁素体内部引发并传播,但在珠光体中传播之前被阻止在铁素体区域内。数字图像相关性(DIC)用于测量通过原位拉伸试验获得的变形显微照片中的局部应变,可以测量发生早期铁素体-石墨脱粘或发生微裂纹的区域的显微组织中较高的应变局部性。裂纹开始。%原位拉伸试验;数字图像相关;微裂纹石墨基体脱粘;开裂

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