(i) A standard concrete test specimen is 200 mm high and 100 mm diameter. Explai
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Question
(i) A standard concrete test specimen is 200 mm high and 100 mm diameter. Explain why this is a suitable size for the test specimen.
(ii) Use annotated sketches to explain why ceramics behave differently in tension and three point bending.
(iii) Fig 2c shows the probability distribution of survival for values of Weibull modulus (m) of 5, 10 and 20. For a stress value ?* sketch the typical flaw structure in specimens when m = 5 and m = 20.
(iv) Consider a high temperature gas turbine blade made from an engineering ceramic. Given the choice of Weibull modulus for the engineering ceramic of 5, 10 or 20 what value would you select and why?
Ps(Vo Xx 20 10 m 5 0 ?? Figure 2cExplanation / Answer
1)For concrete testing be it Cube, Beam, Cylinder the dimensions selected are such that MINIMUM DIMENSION WHICH WILL EXIBIT SAME STRENGTH AS THAT FOR ANY OTHER DIMENSION AT ACTUAL SITE. Hence after doing research on various sizes and shapes it was discovered that 200mm×100mm is the Best MINIMUM DIMENSION that can relate to actual strength obtained at site.
The secondary reasons are:
1. Smaller dimension cubes are easy in casting & curing.
2. For larger dimensions the loading capacity of testing equipment is also expected to be high i.e. Higher cost of Equipment
3. And if testing loads are high safety required for people handling equipment are also high
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