Numerical Analysis of Composite Wind Turbine Blade Considering Failure Behavior

2012 ◽  
Vol 166-169 ◽  
pp. 375-378
Author(s):  
Man Wang ◽  
Rui Xiang Bai ◽  
Yan An Shen
Keyword(s):  
Turbine Blade ◽  
Failure Criterion ◽  
Shear Failure ◽  
Stiffness Degradation ◽  
Failure Behavior ◽  
Compressive Failure ◽  
Fiber Failure ◽  
Matrix Shear ◽  
Analysis Models ◽  
Complicated Configuration

The paper studies the failure of the 3-D complicated configuration composite turbine blade by applying failure criterion. This failure criterion considers three kinds of different failures. They are matrix tensile/compressive failure, fiber- matrix shear failure and fiber failure. By Using FEA software ABAQUS, the stiffness degradation and failure behavior of the turbine blade of composite structure were studied. The failure and stiffness degradation of the two analysis models were conducted by typical numerical examples as well.

Axial-Shear Failure Behavior of Human Femoral Trabecular Bone

1999 ◽  
Author(s):  
Yves P. Arramon ◽  
Oscar C. Yeh ◽  
Elise F. Morgan ◽  
Tony M. Keaveny
Keyword(s):  
Mechanical Behavior ◽  
Trabecular Bone ◽  
Failure Criterion ◽  
Shear Failure ◽  
Computer Models ◽  
Failure Behavior ◽  
Multiaxial Loading ◽  
Bone Implant ◽  
Computer Aided ◽  
Stress States

Abstract An understanding of the failure of trabecular bone subjected to multiaxial loading has relevance in the mechanics of trauma and bone implant interfaces. The development of computer aided tomography-based computer models allow predictions of the mechanical behavior of whole bones when subjected to stress states too complex to be described analytically (Ford et al., 1996; Keyak et al., 1998; Oden et al., 1998). However, these models cannot confidently predict the failure of the trabecular bone without an experimentally validated multiaxial failure criterion.

scholarly journals LSSVM-Based Rock Failure Criterion and Its Application in Numerical Simulation

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Changxing Zhu ◽  
Hongbo Zhao ◽  
Zhongliang Ru
Keyword(s):  
Rock Mass ◽  
Failure Criterion ◽  
Nonlinear Problems ◽  
Failure Criteria ◽  
Rock Failure ◽  
Support Vector ◽  
Failure Behavior ◽  
Circular Tunnel ◽  
Vector Machines

A rock failure criterion is very important for the prediction of the failure of rocks or rock masses in rock mechanics and engineering. Least squares support vector machines (LSSVM) are a powerful tool for addressing complex nonlinear problems. This paper describes a LSSVM-based rock failure criterion for analyzing the deformation of a circular tunnel under differentin situstresses without assuming a function form. First, LSSVM was used to represent the nonlinear relationship between the mechanical properties of rock and the failure behavior of the rock in order to construct a rock failure criterion based on experimental data. Then, this was used in a hypothetical numerical analysis of a circular tunnel to analyze the mechanical behavior of the rock mass surrounding the tunnel. The Mohr-Coulomb and Hoek-Brown failure criteria were also used to analyze the same case, and the results were compared; these clearly indicate that LSSVM can be used to establish a rock failure criterion and to predict the failure of a rock mass during excavation of a circular tunnel.

scholarly journals Numerical analysis of the compressive and shear failure behavior of rock containing multi-intermittent joints

2019 ◽  
Vol 347 (1) ◽  
pp. 33-48 ◽  
Author(s):  
Xiang Fan ◽  
Hang Lin ◽  
Hongpeng Lai ◽  
Rihong Cao ◽  
Jie Liu
Keyword(s):  
Numerical Analysis ◽  
Shear Failure ◽  
Failure Behavior

scholarly journals Deformation and Failure Behavior of Wooden Sandwich Composites with Taiji Honeycomb Core under a Three-Point Bending Test

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2325 ◽  
Author(s):  
Jingxin Hao ◽  
Xinfeng Wu ◽  
Gloria Oporto ◽  
Jingxin Wang ◽  
Gregory Dahle ◽  
...  
Keyword(s):  
Shear Failure ◽  
Dominant Role ◽  
Honeycomb Structure ◽  
Structure Design ◽  
Bending Test ◽  
Failure Behavior ◽  
Sandwich Composites ◽  
Honeycomb Core ◽  
Deformation And Failure ◽  
Three Point Bending

A new type of Taiji honeycomb structure bonded outside with wood-based laminates was characterized from a mechanical standpoint. Both theoretical and experimental methods were employed to analyze comprehensively the deformation behavior and failure mechanism under a three-point bending test. The analytical analysis reveals that a Taiji honeycomb has 3.5 times higher strength in compression and 3.44 times higher strength in shear compared with a traditional hexagonal honeycomb. Considering the strength-weight issue, the novel structure also displays an increase in compression strength of 1.75 times and shear strength of 1.72 times. Under a three-point bending test, indentation and core shear failure played the dominant role for the total failure of a wooden sandwich with Taiji honeycomb core. Typical face yield was not observed due to limited thickness-span ratio of specimens. Large spans weaken the loading level due to the contribution of global bending stress in the compressive skin to indentation failure. A set of analytical equations between mechanical properties and key structure parameters were developed to accurately predict the threshold stresses corresponding to the onset of those deformation events, which offer critical new knowledge for the rational structure design of wooden sandwich composites.

scholarly journals An Approach for Stability Analysis of Gas/Fluid-Filled Cylindrical Hole in Laminated Materials

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Song Leng ◽  
Li Hou ◽  
Yang Duan
Keyword(s):  
Failure Criterion ◽  
Shear Failure ◽  
Cylindrical Hole ◽  
Material Strength ◽  
Strength Anisotropy ◽  
Plane Failure ◽  
Hole Wall ◽  
Weak Plane ◽  
Laminated Materials ◽  
Laminated Structures

An explicit analytical workflow for cylindrical hole stability analyses in general laminated materials that possess transversely isotropic (TI) anisotropy is presented. In this approach, the calculation of the distribution of the stresses around a cylindrical hole and the failure evaluation at the hole wall consider the effects of both material elasticity anisotropy and strength anisotropy caused by material laminated structures. Material strength anisotropy is assumed to be caused by the sliding of preexisting weakness planes oriented parallel to the isotropic plane of the material. The effect of anisotropy on strength is modeled by combining a shear failure criterion for the intact matrix and a weak plane failure criterion for the planes of weakness. We derive critical pressure solutions for the stability of the intact matrix around a hole filled with gas or fluid based on the Mohr–Coulomb failure criterion and Drucker–Prager failure criterion; either one of them can be combined with the weak plane failure criterion to give the solution for hole wall shear failure pressure. The solution for hole wall fracture initiation pressure is derived based on the tensile failure criterion. This approach can be applied to holes of arbitrary orientation in general laminated materials.

Modeling the transverse tensile and compressive failure behavior of triaxially braided composites

2019 ◽  
Vol 172 ◽  
pp. 96-107 ◽  
Author(s):  
Zhenqiang Zhao ◽  
Peng Liu ◽  
Chunyang Chen ◽  
Chao Zhang ◽  
Yulong Li
Keyword(s):  
Failure Behavior ◽  
Compressive Failure ◽  
Braided Composites ◽  
Transverse Tensile

On the failure behavior of fifth stage gas turbine blade

2020 ◽  
Vol 116 ◽  
pp. 104766
Author(s):  
Aliakbar Fallah Sheykhlari ◽  
Saeed Khani Moghanaki ◽  
Mastaneh Moattari ◽  
Ali Shafiei ◽  
Mostafa Amirjan
Keyword(s):  
Gas Turbine ◽  
Turbine Blade ◽  
Failure Behavior ◽  
Gas Turbine Blade
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