Is where the sample is most likely to fail.Įlongated nature of bend test samples, bend testing is frequently usedĪlong with, or instead of, tensile testing, as both tests suit similar The points on the sample that have the highest stressĪpplied are the top and bottom surfaces at the loading point B, and this Plastic deformation occurs and tough samples show a large area under theĬurve corresponding to a large amount of energy required for Stiffer samples show higher forces, brittle samples break before any Samples will give different load-distance responses – stronger and Theįorce-distance graph usually begins with a straight section thatĬorresponds to elastic (reversible) deformation, then most samples show aĬurved section that shows plastic (irreversible) deformation. Sections that is not stretched or compressed, called the neutralĭuring the test, the force applied, the distance movedīy the probe and the time are all recorded in Exponent. Tensile) test – when an object is bent, part of it is compressed and the Is moving down towards the sample, this is not solely a compressive (or Sample is sufficiently brittle and the force required within the limit The sample, first deforming it elastically then plastically. The loading arm moves down at a constant speed to bend With a third roller moving down to contact the sample halfway between (or “rollers” – named due to their curved surface) a set distance apart, It involves a long sample being placed on two supports Point bend testing is the most commonly used set up, and so it will beĭiscussed here. “Flexure” and “bending” have the same meaning and are often However, this test setupĬan also provide useful stress-strain data if the sample has a uniformĬross-section, providing accurate measurements are made of the sampleĭimensions. It is a very useful testįor monitoring quality of irregular objects. The analysis of this type of testing is often limited to looking at aįorce peak and maybe the distance to fracture. Texture Analyser users, covering everything from the snap of tablets to Product is brittle or ductile, stiff or compliant, and strong or weak.Ĭonsequently, bend testing is a technique used very frequently by This process, they are subconsciously assessing whether the food The first things they might do is snap it between their hands. A customer is presented with an elongated or flat food sample, one of