Simulating damage onset and evolution in fully bio-resorbable composite under three-point bending

Gao, Xi; Chen, Menghao; Yang, Xiaogang; Harper, L.T.; Ahmed, Ifty; Lu, Jingjing

doi:10.1016/j.jmbbm.2018.02.022

Cited by 5 publications

(7 citation statements)

References 38 publications

(50 reference statements)

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“…The damage elasticity matrix was adopted to update the stress and the Jacobian matrix in the element. The Jacobian matrix, after the onset of the damage, could be described as expression 4) ( Gao et al, 2018 ). The maximum value of the damage variable was set to 0.9 ( Hambli et al, 2012 ).…”

Section: Methodsmentioning

confidence: 99%

Biomechanical evaluation of different strain judging criteria on the prediction precision of cortical bone fracture simulation under compression

Fan

Liu

Jia

2023

Front. Bioeng. Biotechnol.

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Introduction: The principal strain or equivalent strain is mainly used in current numerical studies to determine the mechanical state of the element in the cortical bone finite element model and then perform fracture simulation. However, it is unclear which strain is more suitable for judging the element mechanical state under different loading conditions due to the lack of a general strain judging criterion for simulating the cortical bone fracture.Methods: This study aims to explore a suitable strain judging criterion to perform compressive fracture simulation on the rat femoral cortical bone based on continuum damage mechanics. The mechanical state of the element in the cortical bone finite element model was primarily assessed using the principal strain and equivalent strain separately to carry out fracture simulation. The prediction accuracy was then evaluated by comparing the simulated findings with different strain judging criteria to the corresponding experimental data.Results: The results showed that the fracture parameters predicted using the principal strain were closer to the experimental values than those predicted using the equivalent strain.Discussion: Therefore, the fracture simulation under compression was more accurate when the principal strain was applied to control the damage and failure state in the element. This finding has the potential to improve prediction accuracy in the cortical bone fracture simulation.

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Section: Methodsmentioning

confidence: 99%

Biomechanical evaluation of different strain judging criteria on the prediction precision of cortical bone fracture simulation under compression

Fan

Liu

Jia

2023

Front. Bioeng. Biotechnol.

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“…This study simulated the cortical bone fracture based on CDM theory. The stress–strain relationship after the onset of the damage can be expressed as [ 5 , 21 ]:

where σ ij is the stress tensor in the element, D is the damage variable in the element, C ijkl is the elasticity tensor of the undamaged material, and ε kl is the strain tensor in the element.…”

Section: Methodsmentioning

confidence: 99%

“…The damage variable expression in the cortical bone material was [ 4 , 21 ]:

where ε pri is the maximum or minimum principal strain in the element, ε y is the critical yield strain in the cortical bone material, and ε f is the critical failure strain in the cortical bone material.…”

Section: Methodsmentioning

confidence: 99%

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Investigation on the Differences in the Failure Processes of the Cortical Bone under Different Loading Conditions

Dai

Fan

et al. 2022

Applied Bionics and Biomechanics

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Cortical bone is a transversely isotropic material, and the mechanical properties may be related to the loading direction on the osteon. Therefore, analyzing the differences in the failure processes of cortical bone under different loading conditions is necessary to explore the measures for reducing the incidence of fracture. In this study, to investigate the effects of different loading directions on the fracture performance in the cortical bone, a numerical method that could simultaneously simulate the failure processes in the cortical bone structure under compression and bending loads was established based on continuum damage mechanics theory. The prediction accuracy and feasibility of the numerical method were first verified by comparing with the corresponding experimental results. Then, the differences in the failure process and fracture performance of the same cortical bone structure under compression and bending loads were investigated. The simulation results indicated that for the same structure, the slip-open failure mode appeared under compression load, and the crack propagated along a certain angle to the loading direction; the tension-open failure mode appeared under bending load, and the crack propagated along the direction perpendicular to the loading direction. Meanwhile, the fracture load was greater and the fracture time was later in the compression than in the bending condition. These phenomena stated that discrepant failure processes and fracture patterns occurred in the same cortical bone structure under different loading conditions. The main reason may be related to the tension–compression asymmetry and transversely isotropic characteristics in the cortical bone material. The fracture simulations in the cortical bone under different loading conditions could improve the prediction accuracy in bone biomechanics and provide the prevention method for cortical bone damage and fracture.

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“…The whole bone is considered as a beam, the flexural stresses of the cross-section in middle position can be defined as (Gao et al, 2018):…”

Section: Three Point Bending Failure Theory Of the Whole Bonementioning

confidence: 99%

Experimental Investigation on the Failure Mechanism of Bovine Bone by Three-point Bending Tests

Li¹,

Gao²,

Li³

et al. 2020

American Journal of Biochemistry and Biotechnology

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Bone damage is a common type of sport injury. The loading rate affects the type of fracture and the degree of soft tissue injury. In view of the problem of whole bone bending damage and failure, this paper introduces the test method of bovine bone bending and the mechanism of bending failure under different loading rates is analyzed through experimental research and theoretical analysis. The results of three-point bending failure test of bovine bone are given and the influence of loading rate on bending failure is discussed. The results show that there are three main deformation and failure modes of bovine bone under different loading rates, namely the mode of fracture failure under high loading rate, the mode of shear failure under medium loading rate and the mode of local wedge failure under low loading rate. With the increase of loading rate, the greater the failure force is applied on the bone, the smaller the destructive deflection of the bone will be. The maximum strain of bone decreases with the increase of loading rate, while the flexural modulus of bone increases gradually, which indicates that the loading rate has an effect on the brittleness of the whole bone. For the bending model of the whole bovine bone, the prediction result of elliptical cross-section method is more in accordance with the actual situation than that of circular cross-section method.

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Simulating damage onset and evolution in fully bio-resorbable composite under three-point bending

Cited by 5 publications

References 38 publications

Biomechanical evaluation of different strain judging criteria on the prediction precision of cortical bone fracture simulation under compression

Biomechanical evaluation of different strain judging criteria on the prediction precision of cortical bone fracture simulation under compression

Investigation on the Differences in the Failure Processes of the Cortical Bone under Different Loading Conditions

Experimental Investigation on the Failure Mechanism of Bovine Bone by Three-point Bending Tests

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