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Abstract: Subcritical crack growth of double torsion specimens made of ore, lherzolite, marble and granite was studied using Instron1342 type electro hydraulic...; fracture toughness; subcritical crack growth; double-torsion specimens; constant displacement load relaxation method
by double-torsion test. The results show that the stress intensity factors obtained from three methods decrease while the crack propagates. And to the same rock, the slope of fitting curves for is lower... the basis for studying time-dependency of rock stability. Key words: stress intensity factor; double-torsion test; Williams series; numerical simulation; subcritical crack growth 近年来,人类修建的岩土工程规模不断扩大,为保证......岩石亚临界裂纹扩展应力强度因子Williams级数计算及数值模拟
来源： 《中南大学学报(自然科学版)2014年第11期》——郝瑞卿 李江腾 曹平 廖峻 刘博
of internal cracks in side beam specimens are experimentally studied by inserting double internal cracks. The effects of crack positions on the fracturing path in the bridge areas of the double cracked beam... by the indirect boundary element method by using only a small number of elements compared with the discrete element method (PFC2D code). Key words: double internal cracks; concrete-like specimens; crack......
Mechanical behavior and failure analysis of brittle sandstone specimens containing combined flaws under uniaxial compressionYANG Sheng-qi(杨圣奇)1, 2, JING Hong-wen(靖洪文)1, XU Tao(徐涛)3(1. State Key... strain curves, the effect of fissure angle on the strength and deformation behavior of sandstone specimens containing combined flaws is analyzed. The mechanical parameters of sandstone specimens......
Verification of Inverse Quench-Hardening Phenomena in Bearing Steel Specimens by Experiment and Computer Simulation Mamoru Tajima1,Chuanrong Jin2,Kyozo Arimoto3,Shigeyuki Tamura2,Kiyoshi Funatani4... at the core after through-hardening of steels is known as"inverse quench-hardening." Pioneering work was performed in the 1970s by establishing a simple test procedure where cylindrical specimens were cooled......
Ultimate Strength Prediction of Carbon/Epoxy Tensile Specimens from Acoustic Emission DataV.Arumugam,R.Naren Shankar,B.T.N.Sridhar,A.Joseph StanleyDepartment of Aerospace Engineering,Madras Institute... technique and cured at a pressure of 100 kg/cm2 under room temperature using a 30 ton capacity compression molding machine for 24 h. 21 tensile specimens (ASTM D3039 standard) were cut from the cross......
of acoustic emission(AE) events in the failure process of several rock specimens was acquired using an advanced AE acquiring and analyzing system. The box counting method(BCM) was employed to calculate the fractal dimension(FD) of AE spatial distribution. There is a similar correlation between the fractal dimension and the load strength for different rock specimens. The fractal dimension presents......
Creep Deformation and Rupture in Smooth and Notched Specimens in HK40 Steel朱世杰,赵杰,王富岗,曹智本摘 要:<正> The effects of the eutectic carbides randsecondary carbides on creep deformation andrupture in smooth bars and CT specimens havebeen studied. The results show that the resistanceof the eutectic carbides of skeleton shape tocrack growth is larger than......
Duality of the fatigue behavior and failure mechanism in notched specimens of Ti-7Mo-3Nb-3Cr-3Al alloyZhihong Wu,Hongchao Kou,Nana Chen,Mengqi Zhang,Ke Hua,Jiangkun Fan,Bin TangJinshan Li State Key... in a metastable β titanium alloy,Ti-7 Mo-3 Nb-3 Cr-3 Al notched cylindrical specimens with an elastic stress concentration factor of Kt=3.Fractographic studies revealed all specimens,and irrespective......
Portland Pozzolana Cement (PPC). The breakage process of the specimens was studied by inserting single and double flaws with different inclination angles at the center and applying uniaxial compressive...Cracks coalescence mechanism and cracks propagation paths in rock-like specimens containing pre-existing random cracks under compressionHadi Haeri1, Kourosh Shahriar2, Mohammad Fatehi Marji3, Parviz......
