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  • 1
    Electronic Resource
    Electronic Resource
    The analyses of the three-dimensional stress structure near the crack tip of mode I CT specimens in elastic-plastic state (I)—The analyses of constraint parameters and fracture parameters (1993)
    Springer
    Applied mathematics and mechanics 14 (1993), S. 659-668 
    Details
    ISSN: 1573-2754
    Keywords: mode I cracked specimen (CT specimens) ; plane strain constraint (γ) ; stress triaxiality (R σ) ; crack tip opening displacement (CTOD) ; void growth ratio (V g )
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract In the present paper, three dimensional analyses of some general constraint parameters and fracture parameters near the crack tip. of Mode I CT specimens in two different thicknesses are carried out by employing ADINA program. The results reveal that the constraints along the thickness direction are obviously separated into two parts: the keeping similar high constraint field (Z1) and rapid reducing constraints one (Z2). The two fields are experimentally confiremed to correspond to the smooth region and the shear lip on the fracture face respectively. So the three dimensional stress structure of Mode I specimens can be derived through discussing the two fields respectively. The distribution of the Crack Tip Opening Displacement (CTOD) along the thickness direction and the three dimensional distribution of the void growth ratio (Vg) near the crack tip are also obtained. The two fracture parameters are in similar trends along the thickness direction, and both of them can reflect the effect of thickness and that of the loading level to a certain degree.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02455387
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  • 2
    Electronic Resource
    Electronic Resource
    The analyses of the three-dimensional stress structure near the crack tip of mode I CT specimens in elastic-plastic state (II)—The analyses of the stress structure (1993)
    Springer
    Applied mathematics and mechanics 14 (1993), S. 817-828 
    Details
    ISSN: 1573-2754
    Keywords: stress structure ; singularity ; Z 1 region ; stress triaxialityRσ ; CTOD ; shear lip ; interpolative method ; degree parameter of the plane strain state
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract Based on [1], the stress structures of the smooth region and shear lip of the specimens have been investigated in the paper. The characteristics of the stress structure in the smooth region have been found that the variable z can separated out; the stresses in the midsection can be obtained by the plane strain FEM results or HRR structure modified by the stress triaxiality. The effects of load level and thickness on the stress structure can be reflected by the distribution of CTOD along the thickness direction. The obtained expressions of the stresses are very simple and visualized. The analyses of the stress structure in the shear lip show that the stresses can be obtained by different methods of interpolation to a certain precise degree. A new degree parameter of the plane strain state has been put forward and studied. The parameter can reflect relatively well the variation of the kind and thickness of the specimen as well as the load level. The fracture parameter has also been investigated to be sure that it can be obtained by modified CTOD with the stress triaxiality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457476
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    Paper (German National Licenses)
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