Joints impact-testing

All pressure retaining steels applied at a specified minimum design metal temperature (2.11.4.5) below -30°C (-20°F) require a Charpy V-notch impact test of the base metal and the weld joint unless they are exempt in accordance with the requirements of paragraph UHA-51 in Section Vlll, Division 1 of the ASME Code. Impact test results shall meet the requirements of paragraph UG-84 of the Code. 

Figure 5 of the impact test showed that J-9 polyurethane was able to reduce the peak force value down to 36% that of steel balls without sacrificing mechanical strength. The result from the impact test and the measurement damping coefficient indicate that polyurethane J-9 is the optimum sphere material in the new total elbow joint replacement design. 

Conclusions. Results from the biocompatibility studies in rabbit supratellar bursa, measurement of hydrophilic properties, lubrication and wear in-vitro studies, determination of viscoelastic properties, measurement of damping coefficient and impact test, total elbow joint replacement design and in-vivo percutaneous implant experiment, all indicate that this series of polyurethanes is an excellent candidate biomaterial for the prosthetic replacement of articular cartilage, artificial joint prostheses and percutaneous implantable devices. 

ISO 11343, 1993, Adhesives—Determination of dynamic resistance to cleavage of high strength adhesive bonds under impact conditions- Wedge impact method The method is mainly aimed for the characterisation of metal substrates suitable for automotive applications. An instrumented impact testing machine (pendulum type) of 50-300 J and. 3-5.5ms maximum capacity is required for this test. A blunt wedge of approximately 1 mm tip radius and included angle of 8 is impact driven into a bonded joint at 3 ms" for aluminum alloy adherends and 2 ms" for steel adherends. The impact event should be... 

Velocity of 14.9 km/h (9.24 m/h) was required to obtain the AAR specified load. It is noted that this velocity is significantly higher than the velocity required to reach the specified force with conventional steel covered hopper cars, which is about 12.1 km/h (7.5 m/h). Glasshopper 1, with modified bulkhead joints, successfully passed the AAR impact test required and was subsequently prepared for the extended road test. 

Schematics of the impact test on cylindrical butt joints used by Sawa et al. (2002) and Sawa et al. (2003)...

In addition to the strength of adhesives under impact, also the properties related to dynamic deformabdity are of interest. Sato and Ikegami (2000) have studied the cases of lap joints and scarf joints subjected to axial impact loads. Preliminarily, they have measured the attenuation of the axial-strain waves in a special specimen of epoxy adhesive, manulactured (by molding the adhesive resin) as a cylinder of length 900 mm and diameter 20 mm. From these results the complex compliance of the material was obtained and, in turn, used to identify the parameters of a five-element Voigt model of viscoelasticity. These material data have been introduced in the finite element simulation of the impact tests on the joints. The joints used in... 

Experimental equipment for impact testing of lap and scarf joints (From Sato and Ikegami [2000], copyright Elsevier)... 

Adams RD, Harris JA (1996) A critical assessment of the block impact test for measuring the impact strength of adhesive bonds. Int J Adhes Adhes 16 61—71 AdamvaUi M, Parameswaran V (2008) Dynamic strength of adhesive single lap joints at high temperature. Int J Adhes Adhes 28 321-327... 

Adhesion Society. He is active in organising conferences and publishing and was a founder member of EURADH and WCARP, the main European and World series on Adhesion. He has been Joint Editor-in-Chief of the International Journal of Adhesion and Adhesives since 1999. His main research area is on adhesively bonded joints and he pioneered the application of finite element analysis for determining the stresses, strains, and strength of such joints. In addition to his adhesives research, he has also worked extensively on vibration properties in composites and developed low-velocity impact tests for non-destructively testing composites and sandwich structures. 

Pendulum impact testing, 118 PENT test, 146 Pipe and fittings D 2152,197 joint testing, 93 polyvinylcmoride, 197 slow crack growth resistance, 146... 

Through this work PE butt fusion welded joints were evaluated by means of three point bend sharp notched impact tests. Weld performance at varying temperatures was quantified wifli the aid of Fracture Mechanics techiuques at 1 m/s where dynamic effects are low. The appUcation of conventional fracture mechanics analyses is Umited up to proximately 1 m/s loading rate [6]. Therefore the effect of test velocity on weld performance was evaluated through the absorbed impact energy at 20 C. The smdy was conqrlrted with scanning electron microcopy (SEM) analysis. 

The effect of test velocity on weld performance was investigated with impact tests performed at 20 C and 1, 2 and 3.7 m/s. Over this range the dynamic effects very often overshadow the true material response and additional measurement techniques must be applied to determine dynamic fracture toughness [8]. Therefore impact strength was evaluated as the ratio of the total consumed energy and the resistant area. The quahty of fused polyethylene joints was assessed by means of the weld efficiency, cp [9], which is defined as ... 

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