As the turbine industries need to manufacture turbine blades made of martensitic stainless steel AISI 420 with high toughness and wear resistance, local laser hardening has become more and more important. In this research, surface of the samples was initially hardened by high-power pulsed laser beam; then, optimum parameters of hardening were calculated and wear resistance of surface hardened s...

Oil debris sensors are effective tools to monitor wear particles in lubricants. For in situ applications, surrounding noise and vibration interferences often distort the oil debris signature of the sensor. Hence extracting oil debris signatures from sensor signals is a challenging task for wear particle monitoring. In this paper we employ the maximal overlap discrete wavelet transform (MODWT) w...

Introduction Total joint arthroplasty (TJA) is commonly used to alleviate the debilitating effects of arthritis. Nevertheless, up to 25% of TJA cases will require surgical revision due to implant failure. The generation of wear debris through articulation of the artificial joint is considered one of the prime factors promoting the chronic inflammation that leads to implant failure. Previous stu...

Wear debris was extracted from 21 worn hip and knee replacements. Its mutagenic effects were tested on human cells in tissue culture using the micronucleus assay and fluorescent in situ hybridisation. The extracted wear debris increased the level of micronuclei in a linear dose-dependent manner but with a tenfold difference between samples. The concentration of titanium +/- vanadium and alumini...

The ABG I cementless hip prosthesis has demonstrated unacceptably high rates of wear and osteolysis in our patients. We performed a retrospective study of 97 hips implanted between 1992 and 1998. Radiographic analysis revealed high rates of wear of the polyethylene liner with marked peri-acetabular osteolysis. Clinical examination indicated that many of these patients were initially asymptomati...

INTRODUCTION: Metal on metal bearings exhibit a biphasic wear mode, starting with a ‘bedding-in’ period of higher wear followed by a lower steady wear which may have favorable total wear [1]. However, there are cases of ‘run-away’ wear resulting in significantly higher total wear for the metal on metal bearing [2,3]. Many of these ‘run-away’ cases need to be revised which brings up the followin...

Fretting corrosion of as received and shot peened zirconium alloys exposed to high temperature pressure water is tested. High resolution characterization techniques are applied study the microstructure composition worn surface. The results show that peening increases wear resistance material, changing mode from abrasive plus delamination wear. Mechanical promotes alloy by forming a thick dual-l...

INTRODUCTION: Several different types of devices are available to aid in spinal fixation. Clinical results are usually acceptable but aseptic loosening may occur, and may be accompanied by particles of wear debris. Debris is now recognized as a probable cause of loosening of total joint prostheses, but the magnitude of debris associated with spinal devices, and it's relation to motion are uncle...

UNLABELLED Wear debris generated by ultra-high molecular weight polyethylene (UHMWPE) used in joint replacement devices has been of concern due to reductions of the implant longevity. Cold atmospheric plasma (CAP) has been used to improve the wear performance of UHMWPE. Our aim was to investigate the elastic and adhesive properties of rat mesenchymal stem cells (rMSCs), through AFM, after expos...