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Destructive testing mechanical loading

Stainless steel type 321 with addition of titanium has been used to enhance the mechanical performance of the structural material at high temperature (520-550 C). The intensive French programme of non-destructive tests since 1989 has shown that 321 stainless steel has not performed satisfactorily over time, with cracks in welded joints occurring under load and high temperature. The sections of Phenix secondary pipework made in this steel have been replaced by 316SPH steel. [Pg.7]

The development of the WPCs for load-bearing structural applications necessitates the characterization of their strain rate-dependent mechanical properties. In this regard, the effect of strain rate on flexural properties of WPG was addressed by Tamrakar and Lopez [49]. The strain at failure was not significantly influenced by the strain rate variation. A prediction model for the effects on strain rate on the modulus of elasticity (MOE) of WPG material was demonstrated based on the viscoelastic standard solid model. Yu et al. [50] analyzed the variability of the dynamic young s modulus of WPG, which was measured by different non-destructive test (NDT) methods. They also estimated the correlativity between the dynamic Young s modulus and the static MOE of WPG. [Pg.391]

This second group of tests is designed to measure the mechanical response of a substance to applied vibrational loads or strains. Both temperature and frequency can be varied, and thus contribute to the information that these tests can provide. There are a number of such tests, of which the major ones are probably the torsion pendulum and dynamic mechanical thermal analysis (DMTA). The underlying principles of these dynamic tests have been covered earlier. Such tests are used as relatively rapid methods of characterisation and evaluation of viscoelastic polymers, including the measurement of T, the study of the curing characteristics of thermosets, and the study of polymer blends and their compatibility. They can be used in essentially non-destructive modes and, unlike the majority of measurements made in non-dynamic tests, they yield data on continuous properties of polymeric materials, rather than discontinuous ones, as are any of the types of strength which are measured routinely. [Pg.116]

An important mechanical test of a metal is the tensile test to destruction. Increasing loads are applied to a specimen of the metal until it breaks. For a mild steel specimen, a graph of load against extension looks like this ... [Pg.149]

The mechanical behaviour of laminated composites under external load and other actions is very complex. The overall properties should be designed and tested together with those of each single lamina. In addition, the conditions of their bonding should be verified because destruction may occur via different processes ... [Pg.22]


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