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%. The crack paths, generated by Vickers indentation on the polished surfaces of both composites, were analyzed from a fractal point of view to distinguish the possible toughening mechanisms involved. Quantitative evaluation of indentation cracks indicates that the crack deflection plays a more effective role. Cracks of the ATC composites show higher deflection angles and more deflections along the path......
grown oxide scales for pure nickel were investigated using Vickers indentation technique. The nickel samples were oxidised at 1200℃ for 100h-600h. The crack length induced by Vickers indentation test...Investigation of Adhesion and Fracture Toughness of Thermally Grown Oxide Scales by Interface Indentation Test P. Lours1,QI Yu-hong2,p. Bruckel1,ZHANG Zhan-ping2 (1.Research Centre on Tools......
formation and propagation during the Vickers indentation testing. The results show that the median crack initiates in the interface under indenter, before ring crack occurs as the indenter presses... Vickers indentation fracture (VIF) toughness to KIC, it is simply suggested to calculate a mean value for KC by using the average equation. For the Palmqvist crack pattern, the crack equation according......
Mechanical properties of AISI 1045 ceramic coated materials by nano indentation and crack opening displacement methodWANG Yan-rong(王燕荣), WANG Yi-qi(王一奇), HUI Zhi-peng(惠志鹏), SONG Jung-il(Department of Mechanical Engineering, Changwon National University, Changwon 641-773, Korea)Abstract:An effective approach was conducted for estimating fracture toughness using the crack opening displacement (COD......
thickness under spherical indentation are investigated within the framework of linear fracture mechanics. The J-integral associated to such cracks was computed. The evolution of J-integral vs the crack length...Element Analysis of Ceramic Coatings under Spherical Indentation with Metallic Interlayer: PartⅡRing CrackMinh-Quy LE,Seock-Sam KIM摘 要:<正>Spherical......
In-situ Observation of Crack Growth and Domain Switching Around Vickers Indentation on BaTiO3 Single Crystal Under Sustained Electric FieldBing JIANG1,Meicheng LI11. State Key Laboratory of Alternate... microscope.The evolutions of domain switching and crack propagation were in-situ observed when a 90 a c domain wall moved across the indentation which was driven by external electric field.The results show......
J. Cent. South Univ. (2019) 26: 3045-3056 DOI: https://doi.org/10.1007/s11771-019-4235-z Crack evolution behavior of rocks under confining pressures and its propagation model before peak stress ZUO... University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019 Abstract: The understanding of crack propagation characteristics and law of rocks during the loading process is of great......
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the direction of electric field was perpendicular to the direction of original polarization, the 90° domain switching at crack tips of the Vickers indentation on the originally in-plane poled PLZT ceramics... two pairs of symmetrically distributed crack tips introduced by Vickers indentation with two types of originally poled PLZT ceramic specimens by in-situ Raman spectroscopy in the absence and presence......
垂直电场下BaTiO3单晶的畴变与压痕裂纹的演化赵显武1,褚武扬2,乔利杰2(1.北京市北京大学力学与空天技术系2.北京科技大学 腐蚀与防护中心)摘 要:利用微分干涉相衬显微镜,在垂直于极化方向的电场下,对BaTiO3单晶的畴变过程和单晶上压痕裂纹的变化过程进行了原位观察.通过对压痕周围和远离压痕区畴变过程的对比,研究了压痕对其周围畴变的影响.结果显示,面内极化试样在垂直于极化方向的面内电场作用下,原有压痕和压痕裂纹随整个试样经历90°畴变后也要发生变化,变化后其形貌与在新的极化状态下重新压制的压痕相似;对离面......
