Characterization of three- and four-point bending properties of porous metal fiber sintered sheet

The adhesive strength of ceramic - copper interfaces was measured in four point bending using a central notch for crack initiation. According to our method, plastic deformation may occur during the delamination process. FEM simulations were employed in order to separate elastic and plastic contributions to the energy consumption of the experiment. In conclusion, a novel delamination criterion based on the stress intensity at the crack tip was established. Here, the stress invariant J3is used as indicator for delamination of the interface. Agreement between experiments and theoretical interpretation is demonstrated for copper layers directly bonded to aluminum oxide.

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Characterization of in vivo strain in the rat tibia during external application of a four-point bending load

Journal of Biomechanics ◽

10.1016/0021-9290(92)90082-c ◽

1992 ◽

Vol 25 (10) ◽

pp. 1241-1246 ◽

Cited By ~ 73

Author(s):

M.P. Akhter ◽

D.M. Raab ◽

C.H. Turner ◽

D.B. Kimmel ◽

R.R. Recker

Keyword(s):

External Application ◽

Four Point Bending ◽

Bending Load ◽

Rat Tibia

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Research on Damage and Bending Properties of AZ31 Magnesium Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.184-185.1163 ◽

2012 ◽

Vol 184-185 ◽

pp. 1163-1166

Author(s):

Xi An Xie ◽

Gao Feng Quan

Keyword(s):

Magnesium Alloy ◽

Applied Load ◽

Bending Strength ◽

Az31 Magnesium Alloy ◽

Bending Test ◽

Bending Properties ◽

Four Point Bending ◽

Heat Treated ◽

Four Point Bending Test ◽

Initial Cracks

Through the four-point bending test of lath-shaped heat treated AZ31 magnesium alloy, the bending properties and damage characteristics were explored. The results show that the optimal bending strength of the magnesium alloy were 355.1MPa and 259.2MPa for extruded and cast samples, respectively, after corresponding heat treatment with 350°C, 90min and 400°C, 30min. The initial cracks both occurred at the loading point after applied load exceeded the yield limit of AZ31 magnesium alloy. Surface bump, cracks and other damage morphology accompanied by a large number of twinning organizations were found on the surface of the samples.

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Long-Term Reliability Assessment of Bioceramics for Artificial Joints Using Microdamage Monitoring by AE

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.309-311.1191 ◽

2006 ◽

Vol 309-311 ◽

pp. 1191-1194

Author(s):

Shuichi Wakayama ◽

Teppei Kawakami ◽

Junji Ikeda

Keyword(s):

Critical Stress ◽

Reliability Assessment ◽

Physiological Saline ◽

Bending Test ◽

Unstable Fracture ◽

Artificial Joints ◽

Bending Tests ◽

Four Point Bending

Microfracture process during bending tests of alumina ceramics used for artificial joints was evaluated by acoustic emission (AE) technique. Four-point bending tests were carried out in air, refined water, physiological saline and simulated body fluid. AE behavior during bending test inhibited the rapid increasing point of AE events and energy prior to the final unstable fracture. It was understood that the bending stress at the increasing point corresponds to the critical stress for maincrack formation. The critical stress was affected by water in environments more strongly than fracture strength. Consequently, it was suggested that the characterization of maincrack formation is essential for the long-term reliability assessment of load-bearing bioceramics.

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