MATERIAL TESTING

Organizations and consumers place their trust in various materials every day. Throughout every major industry, engineers need to be assured that the materials used in manufacturing their products or equipment are up to their intended task. Therefore, they must actively and diligently verify that the manufacturing processes will perform to expectations. Materials testing is a highly precise technique that measures the characteristics of materials, such as mechanical properties, elemental composition, corrosion resistance and the effects of heat treatments. Most testing is performed on metallic materials, composites, ceramics and polymers.

High-speed imaging is applied to materials testing in order to measure the physical and mechanical properties of different materials or components. Typical testing methods include: Tensile Testing, Drop Testing, Compression, Deformation, Crush Resistance, Delamination and many more. Photron high-speed cameras have been designed to meet the requirements of specialized analysis techniques employed in materials testing including Digital Image Correlation.

Experimental Studies on the Deformation and Rupture of Thin Metal Plates Subject to Underwater Shock Wave Loading

In this paper, the dynamic deformation and rupture of thin metal plates subject to underwater shocl wave loading are studied by using high-speed 3D digital image correlation. An equivalent device consist of a gas gun and a water anvil tube was used to supply an exponentially decaying pressure in lieu of explosive detonation which acted on the panel specimen. 

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Experimental Study of the Effectiveness of Sacrificial Cladding Using Polymeric Foams as Crushable Core with a Simply Supported Steel Beam

The present paper focuses on the study of the effectiveness of the sacrificial cladding using polymeric foam as crushable core to reduce the delivered blast energy using a simplified structure. The latter consists of a simply supported steel beam under a localized blast load. The tested sacrificial cladding has a cross-sectional area of 80 × 80 mm2. The effect of the front plate mass and the crushable core properties (plateau stress and thickness) is studied. Three polymeric foams are investigated: (a) the expanded polystyrene foam (PS13) with a density of 13 kg/m3, (b) the closed-cell polyurethane (PU30) with a density of 30 kg/m3, and (c) the open-cell polyurethane (PU50) with a density of 50 kg/m3. Four front plate masses are used: 144, 188, 336, and 495 g. All possible combinations are tested to determine their absorption capacity. The obtained results show that the absorption capability increases by increasing the front plate mass, the plateau stress, and the thickness of the crushable core. The open-cell polyurethane PU50 performs better. Disintegration problems are observed on the expanded polystyrene PS13 after the end of the compression process.

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Molding and Simulation for an Optimized Design of a Dynamic Bending Test

Performance prediction of fibre-reinforced concrete structures under impact is of major importance in a wide range of industrial applications. Therefore,the study of the dynamic behaviour of the material is necessary to quantify the dynamic mechanical properties of the material interms of both mechanical response and fracture behaviour: dynamic fracture energy and tensile strength. This study aims to design a modified Hopkinson bar bending test with a series of numerical simulations prior to the actual test in order to select a feasible experiment configuration. Results of a dynamic bending experiment on a steel fibre-reinforced concrete specimen loaded up to failure are presented.

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