Damage accumulation during compression test of alumina femoral head for artificial hip joint was monitored by acoustic emission (AE) technique. Since a number of mechanical noises due to the friction disturbed AE measurement during the test using conventional apparatus, the testing apparatus was modified. Using the modified apparatus, rapid increase in AE energy was observed before the final fracture. This would be correlated to the maincrack formation which leads to the final fracture. Fracture strength and critical stress for maincrack formation were also computed by FEM. Both exhibited smaller values than bending strengths, which might be caused by the size effect of strength. Finally, reliability assessment based on AE technique for ceramic femoral head was demonstrated.
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- Long-Term Reliability Assessment of Ceramic Femoral Head Based on Microfracture Analysis Using Acoustic Emission Technique
- Springer Berlin Heidelberg