T simple stabilizing jigs for bonded lingual retainer wires are easily fabricated from materials in the office, using the following procedure: 1. Bend a circular retentive tag into one end of an .031" stainless steel wire segment.* 2. Double-wind the wire 6-8mm from the tag to form a helix with an internal diameter of 3mm (A). 3. Bend the other end of the wire 90°, leaving a space of about 2mm ...

Residual stress present in coupons used for fracture testing will influence the experimental determination of fracture toughness. Triaxial residual stress (e.g., due to welding) can alter both the driving force for fracture and the crack-tip constraint at a specified load, so that the apparent toughness of a coupon depends on the residual stress present. In this paper, we employ a micromechanic...

M ODERN dental practice makes wide use of precious metal alloys in wire form as partial denture clasps and as orthodontic appliances. When used in such applications, these alloys are subject only to bend loading and never to pure tensile loading. For this reason, there has long been a feeling within the dental profession that the tensile test for wires was somewhat inappropriate and might be re...

Abstract In this study, mode I fracture tests on cracked straight-through Brazilian disc (CSTBD) and notched semi-circular bend (NSCB) shale specimens with different sizes were conducted to investigate the difference between maximum tangential stress criterion size effect law (SEL) model in predicting apparent toughness ( K a ) of shale. addition, effects specimen geometry selection prediction ...

CSTP (Circular Self Test Path) is an attractive technique for testing sequential circuits in the nanometer era because it can easily provide at-speed test. But the area overhead of CSTP is high if random-pattern-resistant faults need to be reliably tested. This paper presents a deterministic CSTP (DCSTP) structure that embeds pre-computed test data with predictable area overhead. Experimental r...

The influence of specimen size on the measured values true mode II fracture toughness (KIIc) rocks have been investigated both experimentally and theoretically. In experimental study, double-edge notched Brazilian disk (DNBD) test is utilised to perform experiments with various radii ranging from 27 101 mm. Test results demonstrate a significant increase KIIc size. reason for this trend explain...