surface damage
4.The results show that compared to the slope without ecomat mulching,ecomat mulching can decrease erosion modulus from 13 250 t/(km~2·a) to null,surface damage rate at the down-slope highway decreases by 1.89 percent,and highway damage intensity decreases from 21 969.7 cm~3/m~2 to 12 997.8 cm~3/m~2,40.84 percent reduction with statistical significance(0.05 level).
5.This paper describes the con-cept of UDB, together with its advantages and disad-vantages, and demonstrates the formation damagemechanism during UBD, e.g. , the lack of filter cakeprotection, temporary over-balanced condition, pol-ishing effect and surface damage caused by frictionbetween bit and hole wall and poor cooling, and otherdamages, etc.
7.In view of the corrosion damage of rock and concrete materials by acid becomemore and more serious nowadays, the indentation stress-strain curves, elasticmodulus and brinell hardness of materials in different environments and at differentage were compared to evaluate the corrosion damage and the formula of damagedegree described with indentation elastic modulus and brinell hardness was given toevaluate conveniently surface corrosion damage of materials.
10.According to material and anti-damage traits of the main sub-targets on the airdrome, this paper selects suitable damage effect indexes throught the analysis of the structure of airdrome target and the warfare task of surface-surface conventional missile together with damage mechanism of cluster missile warhead.
