No abstract

No abstract

An analytical model is developed to assess the compressive strength criticality of near-surface interlaminar defects in laminated composites.

Corrosion of reinforced concrete (RC) structures has been one of the major causes of structural failure. Early detection of the corrosion process could help limit the location and the extent of necessary repairs or replacement, as well as reduce the cost associated with rehabilitation work. Non-destructive testing (NDT) methods have been found to be useful for in-situ evaluation of steel corrosion in RC, where the effect of steel corrosion and the integrity of the concrete structure can be assessed effectively. A complementary study of NDT methods for the investigation of corrosion is presented here. In this paper, acoustic emission (AE) effectively detects the corrosion of concrete structures at an early stage. The capability of the AE technique to detect corrosion occurring in real-time makes it a strong candidate for serving as an efficient NDT method, giving it an advantage over other NDT methods.

No abstract

No abstract

ABSTRACT-An experimental program to determine tie pi-enomenological aspects of composite-panel failure under simultaneous compressive n-plane loading and low-velocity transverse impact [C-75 m/s (0-250 ftls)] is described. Highspeed photograohy coupled with the shadow-moire techniq~e is usec to record the phenomenon of failure propagatior. The informat on gained from these records, supplemented by plate sectioning ard observatior for interior damage, has provided informaticn regarding the failure-propagation mechanism.The results show that the failure process can be divided roughly into two phases. In the first phase the plare is inpacted, and tie resulting resoonse causes interla,ninar separation. in the second phase the local damage spreads to the unaamaged portion of tie plate through a combination of laminae b~ckling and further delanination. List of Symbolsn = fringe number V = impact velocity w = out-of-plane displacement w/n = fringe constant At = time interval between frames eo = compression strain ('load')

No abstract