BEND TESTING OF A MILD STEEL, CANTILEVER I-SECTION BEAM MATERIAL: Mild Steel (Commercially available structural steel) SPECIMEN: I-section beam as follows: 54.35 99.54 3.5 X POST-TEST ANALYSIS 5.9 Z Z Load,

P 1006.5 Figure 2: Beam schematic, all dimensions in mm. DEFORMATION MEASUREMENT: 6 Electrical resistance strain gauges, 3 mounted in X- direction, 3 mounted in Z-direction, coupled to a data analyser. M Elastic bending of beam theory indicates that: 1xxx fotot PROCEDURE: 1. Apply load, P, as above in increments of 10 kg up to 80 kg noting all six strain gauge readings at each load increment. 2. Unload beam to zero load in 10 kg reductions noting all six strain gauge readings at each load. 20. d 357 O₂max M, is the bending moment in Nm, d, the depth of the beam in m, and the maximum stress at the strain gauge site. By assuming a value of E, convert the longitudinal strains to stresses and find average values of Gamer, at each value of bending moment, M. Compare with the theoretical stresses./nExperimentation Precise details of items under test, and of the testing system, are required. Sketches, circuit diagrams, and/or CAD drawings are often required in this section. All equipment should be specified fully (i.e. using model numbers, and reference numbers if possible) with the exception of minor ancillary equipment such as a metre rule, protractor etc. This specification may also include the accuracy of the equipment used. Always remember that at some future date the experimental results may be subject to severe scrutiny and the more accurately the system has been specified the less the doubt concerning the test, and the better the chance of remedial action. Concise details of the operations performed should be presented mentioning factors which are of special significance. Trivial statements however should be avoided, but, for example, where the order of performing a number of steps is considered to be important such information should be concisely presented. The writing style should resemble a recipe in a cookbook. It is particularly useful to refer to special precautions taken as this can often eliminate possible doubts in a future enquiry. The purpose of this section is to define the experimental techniques employed without ambiguity, and thus in a way which would permit a complete identical "re-test". Remember it was done in the past.