Short-term stress

Fig. 2-23 Viscoelastic creep behavior typical of many TPs trader short-term stress (a) input stress vs. time profile and (b) output strain vs. time profile.

Previously no stress or applied stress lasting 16 hours with sample coated with vegetable oil prior to testing for the short-term stress-strain behavior shown. 

As previously described (Chapter 2), the area under short-term stress-strain curves provides a guide to a material s toughness and impact performance (Fig. 7-6). The ability of a TP to absorb energy is a function of its strength and its ductility that tends to be inversely related. The total absorbable energy is proportional to the area within the lines drawn to the appropriate point on the curve from the axis. The material in area A is... 

Hertet, R. S., Huget, E. F., de Simon, L. Cosgrave, J. H. (1975). Short-term stress relaxation behaviour of non-metallic restoratives. Journal of Dental Research, 54, 1149-53. 

One line of evidence that supports the view that encystment is not primarilly a strategy to survive through short-term stress is that sexuality is not induced in laboratory cultures by a variety of adverse conditions but instead seems to occur under the relatively specific conditions of nutrient limitation (29, 30). 

Short term stress-strain properties c) Equi-biaxial extension ... 

There are two reasons for using a tensile stress/strain test other than the standard method as typified by ISO 37. First, it can be sensibly argued that a more useful measure of stiffness is the so-called relaxed modulus, i.e. the stress at a given elongation after a fixed time of relaxation this is essentially a short term stress relaxation test. Secondly, it may be more convenient for quality control purposes to have a simple test in which only one parameter is measured. 

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