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第16届全国疲劳与断裂学术会议

作者：薛存雍华东周又和兰州大学西部灾害与环境力学教育部重点实验室兰州大学土木工程与力学学院力学与工程科学系

In order to interpret the two different kinds of experimental results of the effect of applied electric fields on the critical load in piezoelectric ceramics at present,a new fracture criterion,the mechanical crack tip opening displacement fracture criterion,is proposed in this *** mechanical crack tip opening displacement is calculated in two cases based on the mechanical and electrical strip yielding *** order to obtain simple and valid results,the simplified

关键词： crack opening displacement Fracture criterion Piezoelectric ceramics

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Analytical solution for the effective elastic properties of rocks with the tilted penny-shaped cracks in the transversely isotropic background

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Petroleum Science 2024年第1期21卷 221-243页

作者： Zheng-Qian Ma Xing-Yao Yin Zhao-Yun Zong Yuan-Yuan Tan Ya-Ming Yang National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina School of Geosciences China University of Petroleum(East China)Qingdao 266580ShandongChina Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao266200ShandongChina

Seismic prediction of cracks is of great significance in many disciplines,for which the rock physics model is ***,up to now,multitudinous analytical models focus primarily on the cracked rock with the isotropic background,while the explicit model for the cracked rock with the anisotropic background is rarely investigated in spite of such case being often encountered in the ***,we first studied dependences of the crack opening displacement tensors on the crack dip angle in the coordinate systems formed by symmetry planes of the crack and the background anisotropy,respectively,by forty groups of numerical *** on the conclusion from the experiments,the analytical solution was derived for the effective elastic properties of the rock with the inclined penny-shaped cracks in the transversely isotropic ***,we comprehensively analyzed,according to the developed model,effects of the crack dip angle,background anisotropy,filling fluid and crack density on the effective elastic properties of the cracked *** analysis results indicate that the dip angle and background anisotropy can significantly either enhance or weaken the anisotropy degrees of the P-and SH-wave velocities,whereas they have relatively small effects on the SV-wave velocity ***,the filling fluid can increase the stiffness coefficients related to the compressional modulus by reducing crack compliance parameters,while its effects on shear coefficients depend on the crack dip *** increasing crack density reduces velocities of the dry rock,and decreasing rates of the velocities are affected by the crack dip *** comparing with exact numerical results and experimental data,it was demonstrated that the proposed model can achieve high-precision estimations of stiffness ***,the assumption of the weakly anisotropic background results in the consistency between the proposed model and Hudson's published theory for the or

关键词： Effective elastic property Tilted crack Transverse isotropy Analytical solution crack opening displacement

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Study on fracture characteristic of welded high-density polyethylene pipe

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China Welding 2002年第1期11卷 59-63页

作者：齐芳娟霍立兴张玉凤荆洪阳杨新岐 Coll. of Mat. Sci. and Eng. Tianjin Univ. Tianjin 300072 China

crack opening displacement(COD) was applied to characterize the fracture initiation of the tough high density polyethylene. Normal single side notched three point bend specimens and silica rubber replica techniques were used to study the characteristic COD of high density polyethylene pipe and its butt fusion joints including the weld fusion zone and heat affected zone at different temperature from -78 ℃ to 20 ℃ . Testing results show that the characteristic COD appears to depend on the structural features that are determined by welding process and the testing temperature. As the temperature is lowered, the characteristic COD of all zones studied decreases. Because the welding process significantly changes some structural feature of the material, characteristic COD of the weld fusion zone is the smallest one among those of the three zones. The results can be used for the engineering design and failure analysis of HDPE pipe.

关键词： crack opening displacement high density polyethylene pipe butt fusion joint

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CLOSED-FORM WEIGHT FUNCTION FOR EDGE crack PROBLEMS

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Acta Mechanica Sinica 1990年第2期6卷 151-159页

作者： Wu Xueren(X.R.Wu) (Institute of Aeronautical Materials,Beijing 100095) Institute of Acronautical Materials Beijing

An accurate crack surface opening displacement formula for edge cracks in finite bodies has been derived,and was subsequently used to develop wide-range closed-form weight functions for edge cracks. The analytical weight function is general and can be easily used to determine accurate stress intensity factors and crack surface opening displacements for arbitrarily loaded edge cracks with high *** have been given for problems of edge crack(s)with a number of typical load conditions for illustration.

关键词： crack weight function stress intensity factor crack opening displacement fracture mechanics

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Failure mechanisms and destruction characteristics of cemented coal gangue backfill under compression effect of non-uniform load

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Journal of Central South University 2024年第8期31卷 2676-2693页

作者： FENG Guo-rui GUO Wei QI Ting-ye LI Zhu CUI Jia-qing WANG Hao-chen CUI Ye-kai MA Jing-kai College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Province Research Center of Green Mining Engineering Technology Taiyuan 030024China Shanxi Province Coal-based Resources Green and High-efficiency Development Engineering Center Taiyuan 030024China Shanxi Key Laboratory of Mine Rock Strata Control and Disaster Prevention Taiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024China

Backfill mining is one of the most important technical means for controlling strata movement and reducing surface subsidence and environmental damage during exploitation of underground coal resources. Ensuring the stability of the backfill bodies is the primary prerequisite for maintaining the safety of the backfilling working face, and the loading characteristics of backfill are closely related to the deformation and subsidence of the roof. Elastic thin plate model was used to explore the non-uniform subsidence law of the roof, and then the non-uniform distribution characteristics of backfill bodies’ load were revealed. Through a self-developed non-uniform loading device combined with acoustic emission (AE) and digital image correlation (DIC) monitoring technology, the synergistic dynamic evolution law of the bearing capacity, apparent crack, and internal fracture of cemented coal gangue backfills (CCGBs) under loads with different degrees of non-uniformity was deeply explored. The results showed that: 1) The uniaxial compressive strength (UCS) of CCGB increased and then decreased with an increase in the degree of non-uniformity of load (DNL). About 40% of DNL was the inflection point of DNL-UCS curve and when DNL exceeded 40%, the strength decreased in a cliff-like manner;2) A positive correlation was observed between the AE ringing count and UCS during the loading process of the specimen, which was manifested by a higher AE ringing count of the high-strength specimen. 3) Shear cracks gradually increased and failure mode of specimens gradually changed from “X” type dominated by tension cracks to inverted “Y” type dominated by shear cracks with an increase in DNL, and the crack opening displacement at the peak stress decreased and then increased. The crack opening displacement at 40% of the DNL was the smallest. This was consistent with the judgment of crack size based on the AE b-value, i. e., it showed the typical characteristics of “small b-value-large crack and

关键词： cemented coal gangue backfill non-uniform load degree of non-uniformity of load failure mode crack opening displacement

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The Fined COD Transform Formulas of Bending-Type Specimens for Material Fracture Toughness Testing

The Fined COD Transform Formulas of Bending-Type Specimens f...

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2012年海峡两岸破坏科学/材料试验学术会议

作者： Yao Yao Li-xun CAI Chen BAO Department of applied mechanics and engineering southwest jiaotong university

Based on the refined results of the relationships between crack opening displacement (COD) along load line and crack mouth opening displacement(CMOD) by finite element analysis (FEA),the effects of material properties and plastic deformation at the crack tip of a single-edged bending(SEB) specimen and a front-force compact tension(FFCT) specimen on the relationships between COD and CMOD of the two bending specimen types have been *** results show that the plasticity influences are existing but *** simplified and accurate COD transform formulas used for plastic work calculation of J integral for the SEB and FFCT specimens are *** error analysis results show that the two formulas given are very close to the fined FEA results.

关键词： Single-edged Bending Front-force Compact Tension Finite Element Analysis crack opening displacement COD Transformation

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