http://hdl.handle.net/10204/905 Thu, 20 Jun 2013 02:32:25 GMT 2013-06-20T02:32:25Z http://hdl.handle.net/10204/6783 Title: Utilization of ISO 6892:2009 testing standard for determining tensile properties of TM380 mild steel Authors: Shoke, L; Sono, TJ; Olubambi, PA Abstract: The aim of this study was to develop an in-house tensile testing procedure that would yield accurate and reproducible parameters as input material properties into computational models for numerical simulations of the mechanical behaviour of TM380 mild steel. To achieve this objective, we reviewed the ISO 6892:2009 tensile testing standard along with reported good practice guidelines. Tensile tests were conducted on a dog-bone shaped TM380 mild steel specimen with strain gauges attached on either side, to monitor alignment and measure strain, using three different types of tensile testing machines. Parameters quantified included yield stress, ultimate tensile strength, and modulus of elasticity. The values of these parameters were found to be in agreement with the values supplied by the manufacturer's specification and showed minimal variations between laboratories. Thus it can be concluded that the tensile test procedure used resulted in accurate and reproducible results. The strain values calculated as per standard were in disagreement with those determined from extensometer and strain gauges and resulted in lower elastic modulus values. This confirms that the current testing procedures require the use of long-range strain gauges or extensometer to determine the strain. A chemical analysis was conducted to verify the specification by the manufacture. The specimen was found to be fairly homogeneous with minor sulphide inclusions. The micrographs reveal a pearlite and ferrite structure typical of mild steel, and the fractographs show a dimpled surface typical of ductile fracture, which is an attribute of mild steel. Description: Copyright: 2013 SAIMM. This is an ABSTRACT ONLY. The definitive version is published in Journal of the Southern African Institute of Mining and Metallurgy, vol. 113, pp 1-6 Mon, 01 Apr 2013 00:00:00 GMT http://hdl.handle.net/10204/6783 2013-04-01T00:00:00Z http://hdl.handle.net/10204/6742 Title: Environmental change in Bushbuckridge Authors: Erasmus, BFN; Coetzer, K; Mambo, J; Archer, E; Fisher, JT; Asner, GP Abstract: Bushbuck Ridge is a typical cultural landscape where the interdependency of people and the environment shape the savanna ecosystem goods and services upon which many people are dependent. The forced resettlement of people in the apartheid era, together with Mozambican refugees, have resulted in high human densities. The majority of people rely heavily on the rural rangelands for a variety of natural products, and the ability of these ecosystems to continue delivering these products under conditions of climate change and land cover change is in doubt. Historical trends show that settlements are expanding, with an increasing corresponding footprint around each village, where woodland resources are depleted. People can and do adapt to environmental change, but projecting current trends in the changes that we observe, combined with increased unpredictability of rainfall, threatens to decouple the age-old interdependencies in the this cultural landscape, and present inhabitants with conditions beyond their adaptation capacity. Description: Copyiright: Sun Media Publishing,Stellenbosch, South Africa Sun, 01 May 2011 00:00:00 GMT http://hdl.handle.net/10204/6742 2011-05-01T00:00:00Z http://hdl.handle.net/10204/6736 Title: The velocity of the expanding by-products and soil layer on top of a buried landmine Authors: Snyman, I.M Abstract: This paper uses high-speed video images of the PHOTRON APX-RS high-speed camera to determine the velocity of the expanding volume of by-products of a buried landmine. The study analyses three experiments done with the Scientifically Instrumented Impulse Measurement Apparatus (SIIMA) to determine the imparted impulse of a landmine. Two phenomena emerge from the analyses. The expansion of the flush buried mine is very fast while the expansion of the sand layer and volume of by-products when the charge is buried with an overburden is slower. Description: 30th International Congress on High-Speed Imaging & Photonics, CSIR ICC,Pretoria, South Africa, 16 - 21 September 2012. Sat, 01 Sep 2012 00:00:00 GMT http://hdl.handle.net/10204/6736 2012-09-01T00:00:00Z http://hdl.handle.net/10204/6556 Title: The evaluation of MiL-Lx and Hybrid III Leg using Hybrid III and EUROSID2-re Anthropomorphic Test Devices Authors: Pandelani, T Abstract: This paper presents the evaluation of the injury measurement response of the Hybrid III and ES2re ATD’s using both the HIII and MiL-Lx instrumented lower legs as loaded by the Modified Lower Limb Impactor (MLLI). Description: Eighth South African Conference on Computational and Applied Mechanics, (SACAM), Johannesburg, South Africa, 3–5 September 2012. Not part of the 8th SACAM Conference Proceedings. Sat, 01 Sep 2012 00:00:00 GMT http://hdl.handle.net/10204/6556 2012-09-01T00:00:00Z