【摘要】 根据实际构件的特点，主要研究了两种弹体金属材料的非比例试件面内尺寸（α，Ｗ－α）对Ｋ＿（１ｃ）的影响及有效性评价。通过不同试件形状及尺寸的对比试验，初步认为在满足Ｂ≥２．５（Ｋ＿（１ｃ）／σ＿（０．２））￣２的条件下，裂纹深度、韧带尺寸的最低要求是：５８ＳｉＭｎ钢α≥１．７（Ｋ＿（ＩＣ）／σ＿（０．２））￣２、（Ｗ－α）≥２．０（Ｋ＿（１ｃ）／σ＿（０．２））￣２５０ＳｉＭｎＶＢ钢α≥１．６（文中讨论了材料强度级别（σ＿Ｓ／Ｅ）对试件几何尺寸限制要求的影响。更多还原

【Abstract】 Accordjng to the characteristic of real component,the effects of inner surface size of non-proportional specimen on K_IC as well as the Validity evaluation for two kinds of projectile matallic materials are studied The comparing test of different spec imen shape and size showed that,under the condition of B≥2. 5,the lowest requirement of crack depth, toughess band size is α≥.7(for 50SiMn steel and α≥1.6 for 50SiMnVB steel.In the meanwhil,the limitation of material strength level on specimen geometry size is also discussed.更多还原