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Advancements in Mechanical Testing and Damage Analysis of Orthopaedic Materials and Tissues

This research focuses on both static and cyclic mechanical testing of smooth and notched specimens, along with the development of constitutive models for better understanding of materials. Utilizing acoustic emission methodologies, we identify microstructural and ultrastructural damage in bone. Collaborations span across prominent institutions, including CWRU Medical School and Drexel University, with research sponsored by NIH and OREF. Key accomplishments include analysis of material factors affecting fracture resistance in orthopaedic implants and characterizing fatigue crack growth in cortical bone.

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Advancements in Mechanical Testing and Damage Analysis of Orthopaedic Materials and Tissues

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  1. APPROACH • Static and cyclic mechanical testing measurements of smooth and notched specimens; constitutive modeling • Microstructural and ultrastructural damage identification measurements in bone using acoustic emission methodologies • Microstructural and ultrastructural characterizaton of materials using light, scanning and transmission electron microscopy; fourier transform infrared microspectroscopy • COLLABORATIONS • Departments of Orthopaedics and Neurosurgery, CWRU Medical School • Rush Presbyterian Medical School, Chicago, IL • Exponent Failure Analysis; Drexel University, Philadelphia, PA • The Hospital for Special Surgery; Cornell University Medical College, New York, NY • RESEARCH SPONSORS • NIH, OREF, Orthopaedic Industries CLARE M. RIMNAC EMAE ASSOCIATE PROFESSOR OF MECHANICAL & AEROSPACE ENGINEERING and Director, Musculosketeal Biomechanics and Orthopaedic Engineering Laboratories 620 GLENNAN BUILDING cmr10@po.cwru.edu; 216-368-6442; 216-368-3007 (fax) • RESEARCH AREAS AND APPLICATIONS • Mechanical performance of musculoskeletal tissues • Mechanical performance of orthopaedic implant materials • Modeling of musculoskeletal tissues and implant materials • Implant retrieval/failure analysis of total joint replacements • RECENT ACCOMPLISHMENTS • Identified material and sterilization factors affecting the static and cyclic fracture resistance and wear damage resistance of UHMW polyethylene joint replacement components through laboratory testing and implant retrieval/failure analysis • Retrieved total knee • replacement • Characterized the kinetics of fatigue crack growth of (short) microcracks in human cortical bone. Microcracks decelerate and arrest at microstructural barriers. • Fatigue crack growth of Microcracks in bone • microcracks in bone Taylor Prediction

  2. KEY WORDS cmr10 Rimnac mechanical engineering biomechanics biomaterials orthopaedic implants bone tissue ultra high molecular weight polyethylene fatigue and fracture ultrastructural and microstructural damage retrieval/failure analysis

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