Stress-strain field near crack tip and calculation of critical stress of crack propagation in a pure bending beam of rectangular section with one-sided mode i crack

1995 ◽  
Vol 16 (8) ◽  
pp. 779-789
Author(s):  
Liu Hanchi
Keyword(s):  
Crack Propagation ◽  
Strain Field ◽  
Critical Stress ◽  
Crack Tip ◽  
Mode I ◽  
Mode I Crack ◽  
Pure Bending ◽  
Stress Strain ◽  
Rectangular Section

A crack tip driving force model for mode I crack propagation along linear strength gradient: comparison with the sharp strength gradient case

2016 ◽  
Vol 227 (9) ◽  
pp. 2683-2702 ◽  
Author(s):  
Yi-Bo Shang ◽  
Hui-Ji Shi ◽  
Zhao-Xi Wang ◽  
Guo-Dong Zhang
Keyword(s):  
Crack Propagation ◽  
Driving Force ◽  
Crack Tip ◽  
Mode I ◽  
Force Model ◽  
Mode I Crack ◽  
Strength Gradient

scholarly journals Mode I Crack Propagation Experimental Analysis of Adhesive Bonded Joints Comprising Glass Fibre Composite Material under Impact and Constant Amplitude Fatigue Loading

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4380
Author(s):  
Alirio Andres Bautista Villamil ◽  
Juan Pablo Casas Rodriguez ◽  
Alicia Porras Holguin ◽  
Maribel Silva Barrera
Keyword(s):  
Crack Propagation ◽  
Structural Integrity ◽  
Crack Propagation Rate ◽  
Fatigue Loading ◽  
Propagation Rate ◽  
Operating Conditions ◽  
Impact Testing ◽  
Mode I ◽  
Mode I Crack ◽  
Constant Amplitude

The T-90 Calima is a low-wing monoplane aircraft. Its structure is mainly composed of different components of composite materials, which are mainly bonded by using adhesive joints of different thicknesses. The T-90 Calima is a trainer aircraft; thus, adverse operating conditions such as hard landings, which cause impact loads, may affect the structural integrity of aircrafts. As a result, in this study, the mode I crack propagation rate of a typical adhesive joint of the aircraft is estimated under impact and constant amplitude fatigue loading. To this end, effects of adhesive thickness on the mechanical performance of the joint under quasistatic loading conditions, impact and constant amplitude fatigue in double cantilever beam (DCB) specimens are experimentally investigated. Cyclic impact is induced using a drop-weight impact testing machine to obtain the crack propagation rate (da/dN) as a function of the maximum strain energy release rate (GImax) diagram; likewise, this diagram is also obtained under constant amplitude fatigue, and both diagrams are compared to determine the effect of each type of loading on the structural integrity of the joint. Results reveal that the crack propagation rate under impact fatigue is three orders of magnitude greater than that under constant amplitude fatigue.

The dislocation-free zone at a mode I crack tip

1995 ◽  
Vol 50 (2) ◽  
pp. 165-173 ◽  
Author(s):  
Jianqiao Chen ◽  
Shigeo Takezono
Keyword(s):  
Crack Tip ◽  
Mode I ◽  
Mode I Crack ◽  
Free Zone

The Asymptotic Elastic-Viscoplastic Field at Mode I Dynamic Propagating Crack-Tip

2007 ◽  
Vol 348-349 ◽  
pp. 817-820
Author(s):  
Zhen Qing Wang ◽  
Ji Bin Wang ◽  
Wen Yan Liang ◽  
Juan Su
Keyword(s):  
Crack Tip ◽  
Viscosity Coefficient ◽  
Plastic Strain Rate ◽  
Mode I ◽  
Mode I Crack ◽  
Moving Crack ◽  
Dynamic Propagating ◽  
Propagating Crack ◽  
Hardening Condition ◽  
Elastic Unloading

The viscosity of material is considered at propagating crack-tip. Under the assumption that the artificial viscosity coefficient is in inverse proportion to the power law of the plastic strain rate, an elastic-viscoplastic asymptotic analysis is carried out for moving crack-tip fields in power-hardening materials under plane-strain condition. A continuous solution is obtained containing no discontinuities. The variations of the numerical solution are discussed for mode I crack according to each parameter. It is shown that stress and strain both possess exponential singularity. The elasticity, plasticity and viscosity of material at the crack-tip only can be matched reasonably under linear-hardening condition. The tip field contains no elastic unloading zone for mode I crack.

scholarly journals Energy dissipation during delamination in composite materials – An experimental assessment of the cohesive law and the stress-strain field ahead of a crack tip

2016 ◽  
Vol 134 ◽  
pp. 115-124 ◽  
Author(s):  
Meisam Jalalvand ◽  
Gergely Czél ◽  
Jonathan D. Fuller ◽  
Michael R. Wisnom ◽  
Luis P. Canal ◽  
...  
Keyword(s):  
Composite Materials ◽  
Energy Dissipation ◽  
Strain Field ◽  
Crack Tip ◽  
Cohesive Law ◽  
Stress Strain ◽  
Experimental Assessment
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