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دانلود رایکان مقاله انگلیسی ISI با موضوع روش ترجمه دایره ای فرکانس بالای پین روی دیسک برای ارزیابی سریع دوام پلی اتیلن های با وزن مولکولی بالا

عنوان فارسی مقاله:

روش ترجمه دایره ای فرکانس بالای پین روی دیسک برای ارزیابی سریع دوام پلی اتیلن های با وزن مولکولی بالا در تعویض کامل مفصل ران

عنوان انگلیسی مقاله:

High frequency circular translation pin-on-disk method for accelerated wear testing of ultrahigh molecular weight polyethylene as a bearing material in total hip arthroplasty

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قسمتی از مقاله انگلیسی و ترجمه آن:

2. Materials and methods
In the three-station, dual motion HF-CTPOD device (Fig. 1), the pin holder circularly translated clockwise so that the circumference of the track was 1.0 mm, at a cycle frequency of 24.8 Hz, driven by an eccentric (0.16 mm) shaft through a needle bearing (Fig. 2). The eccentric shaft was fixed directly on the rotor shaft of an electric motor with a rotational speed of 1487 rpm, which was measured during the normal running of the test. The three pin holder shafts made from stainless steel were horizontally guided by polyacetal sleeves with a diametral clearance of 0.32 mm. Hence the pins were forced by the eccentric shaft to circularly translate so that the diameter of the slide track was 0.32 mm. The extent of motion was checked with a displacement indicator during the normal running of the test. The advantage of the above mechanism for producing circular translation in a high frequency application was that no roller bearings and eccentric shafts were needed above the test stations. The pins were made from conventional gamma-nitrogen-sterilized (25 kGy) UHMWPE (GUR 1020, ISO 5834-1/-2). Their diameter was 9.0 mm and length 12.0 mm. The contact was flat-on-flat.

2. مواد و روش ها