Experimental techniques toughness

As far as standard ab initio calculations go, it appears to me that in the future there will be improvements to the computational techniques, though my guess is that at the moment they are ahead of the gas-phase experimental techniques. An example of such a computational improvement [94] is the frequency-dependent moment method in which hyperpolarizabilities are evaluated from configuration-interaction matrices without diagonalizing them. However, it should be remembered that calculations of high-order properties, such as the ones we have been discussing here, are a very tough test of computational quantum chemistry. 

The bond between the FRP and concrete has been characterized by using a variety of experimental techniques and a number of studies have been conducted to assess the effects of defects in the substrate, FRP, and the interface as well as environmental conditions prevalent during the application of the FRP. A number of studies have also been conducted using flexural specimens or peel-type tests to assess the effect of environmental exposure on the performance of the rehabilitated beams and fracture toughness, respectively. While these provide useful information regarding the effects of environmental exposure, they do not focus on the critical region of the bond between the concrete and FRP at a level that can be directly of use to the designer or used for field assessment of durability. 

Plain KP, Tong LY. An experimental study on mode I and II fracture toughness of laminates stitched with a one-sided stitching technique. Compos Part A Appl Sci Manuf 2011 42 203—10. http //dx.doi.org/10.1016/j.compositesa.2010.11.006. 

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