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在X射线照相检查中,对于一定的透照条件,金属丝透度计的识别度与裂缝检出力之间可作出对应关系式。如用W表示裂缝的最大宽度,P表示裂缝深度,φ表示照相底片上所能识别的最小金属丝直径,则裂缝的检出力可用下式表示: PW=Kθφ~3 (0.2≤φ≤1适用) 式中K_θ是射线与裂缝面所成的角度θ有关的比例系数。当θ增大时,K_θ也增大,若θ=0,则人工狭缝的K_θ≈1,自然裂缝的K_θ≈2。由此可见,当射
In the X-ray examination, for certain transillumination conditions, the relationship between the visibility of the wire dial gauge and the crack detection force can be made. If W is the maximum width of the crack, P is the depth of the crack, and φ is the minimum wire diameter that can be identified on the photographic film, then the detection force of the crack can be expressed as follows: PW = Kθφ ~ 3 (0.2≤φ≤1 Applicable) where K_θ is the proportional coefficient of the angle θ formed by the ray and the fracture surface. When θ increases, K_θ also increases. If θ = 0, the artificial slit K_θ≈1 and the natural crack K_θ≈2. This shows that when shot