T. S. Srivatsan

An experimental evaluation of the tensile strength of impact ice

The evaluation of the tensile strength of impact built-up ice on structural components has been prompted by such problems as electrical transmission line losses and catastrophic failures in Arctic regions, deicing problems with fixed-wing and rotary-wing aircraft, etc. It is demonstrated that the conventional tensile-testing technique furnishes adequate data on artificially refrigerated ice, and helps establish the influence of extrinsic factors on ice tensile strength.

The effect of oxides on mechanical properties of aluminium-lithium alloys

The rapidly solidified products suffered from the drawbacks associated with oxide contamination. The large surface areas associated with rapidly quenched particulates, in combination with the high reactivity of aluminium made it extremely difficult to eliminate oxides from PM processed products. Instead, it was a matter of the amount of oxide one could tolerate

The effect of strain rate on flow stress, strength and ductility of an Al-Li-Mg alloy

In this letter, we present the influence of strain rate on tensile properties of Al-Mg-Si alloy 6061 and assess the effects of strain rate on the flow curves, strength, work hardening characteristics and ductility of the alloy at ambient temperature. The aluminium alloy 6061 of composition (in wt%) 0.6 % silicon, 0.25 % copper, 1.0 % magnesium, 0.07 % iron, 0.55 % chromium and balance aluminium was in the peak-aged T651 condition

The effect of grain-refining additions to lithium-containing aluminium alloys

Influence des additions de zirconium, manganese et chrome sur la microstructure des alliages Al-Li. Determination des caracteristiques mecaniques, de corrosion et des modes de rupture des alliages apres addition des elements. Interpretation des resultats basee sur la microstructure

Influence of joining on the tensile behaviour of high density polyethylene pipe

Abstracts are not published in this journal

Tensile fracture of a fully spheroidic steel

The present work is a characterization of the tensile fracture behaviour of a fully spheroidized microstructure, and is part of a larger study which investigated the extrinsic effects of strain rate and intrinsic influence of ion implantation on the mechanical properties and fracture behaviour of a high-strength steel

Hydrogen effects on beryllium-copper alloys

Beryllium-copper is a precipitation-hardening alloy system containing from 0.5 to 2.0% beryllium and minor amounts of nickel and cobalt. Depending on the beryllium content, it is divided into two categories based on high strength or high conductivity. However, the alloy system is the most widely used of all beryllium-containing alloys, primarily because it can be precipitation heat-treated to the highest strength levels attainable in copper-based alloys. These alloys are used for applications requiring a combination of high electrical conductivity and mechanical strength, and for applications requiring wear and even corrosion resistance [1, 2]. The alloys have also been chosen because of their non-magnetic characteristics or their hardness, and most often for their innate ability to be worked in a soft condition and then hardened by simple heat-treatments. The non-magnetic nature of the alloy makes it an extremely attractive candidate for precision instrumentation [2]. Heat-treatment is the most important process for the alloy system. Although almost all copper alloys are hardenable by cold working, beryllium-copper alloy is unique because it is hardenable by a single low-temperature thermal treatment. This facilitates the development of desirable properties in these alloys. The phase diagram of the beryllium-copper alloy system is shown in Fig. 1. Age-hardening or precipitation-strengthening is a lower thermal cycle treatment designed to enhance the strength of the material appreciably. During age-hardening the dissolved metastable beryllium comes out of solution and precipitates as the beryllium-rich y-phase, both in the copper matrix and along the grain boundaries. It is the formation of y-precipitates which is responsible for the large increase in material strength. Depending on the alloy composition (beryllium content), ageing temperature and time at temperature, the precipitates can be either fully coherent or incoherent with the matrix. Since precipitation is a nucleation and growth process, the coherent precipitate forms during the early stages of growth and the incoherent precipitate forms during continued ageing at the temperature or while ageing at higher temperatures. The ageing sequence follows

Environment-tensile property relationship in AISI 1018 steel

The present work is a characterization of strain rate and environment influences on the tensile properties of a steel having a fully spheroidized microstructure, and is part of a larger study which investigated the influence of ion implantation on the tensile properties, fracture behaviour, cyclic stress response and fatigue properties of a high strengh steel. The material used in this investigation is AISI 1018 steel