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Schematic of contact area for the JKR model JKR test with a rigid bead on a deformable planar material: complete cycle. To incorporate the effect of adhesion in Hertzian contact, Johnson, Kendall, and Roberts [5] formulated the JKR theory of adhesive contact using a balance between the stored elastic energy and the loss in surface energy. The ...
A brass test cup is filled with a test specimen and closed with a lid, through which an ignition source can be introduced periodically. The sample is heated and stirred at specified rates depending on the material that is being tested.
Finally there are the processes at the contact interface: compression and adhesion in the direction perpendicular to the interface, and friction and micro-slip in the tangential directions. The last aspect is the primary concern of contact mechanics. It is described in terms of so-called contact conditions. For the direction perpendicular to ...
The Braden Scale for Predicting Pressure Ulcer Risk, is a tool that was developed in 1987 by Barbara Braden and Nancy Bergstrom. [1] The purpose of the scale is to help health professionals, especially nurses, assess a patient's risk of developing a pressure ulcer .
An important aspect of care for most people at risk for pressure ulcers and those with bedsores is the redistribution of pressure so that no pressure is applied to the pressure ulcer. [51] In the 1940s Ludwig Guttmann introduced a program of turning paraplegics every two hours thus allowing bedsores to heal.
Diabetic foot ulcer is a breakdown of the skin and sometimes deeper tissues of the foot that leads to sore formation. It is thought to occur due to abnormal pressure or mechanical stress chronically applied to the foot, usually with concomitant predisposing conditions such as peripheral sensory neuropathy, peripheral motor neuropathy, autonomic neuropathy or peripheral arterial disease. [1]
Total contact casting (TCC) is a specially designed cast designed to take weight off of the foot (off-loading) in patients with diabetic foot ulcers (DFUs). Reducing pressure on the wound by taking weight off the foot has proven to be very effective in DFU treatment.
Differences in positive/negative pathergy and severity of the reaction depend on disease activity, ethnicity, type of needle used for the prick test, among other factors. [2] Pathergy test is done both orally and cutaneous. Orally, the lower lip is the site of testing. Appearance of any ulcer or papule indicates a positive pathergy reaction.