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The Ansys finite element software is used to calculate the crack opening displacement and Stress intensity factor (SIF) for Single-edged notched tension (SENT) specimen of Clam steel under the tension of 1000N. During the simulation, the crack opening positions for five groups and the different crack length were set up. The numerical simulation shows that the Model I intensity factor (KI) is larger one order than the Model II intensity factor (KII), the values of the SIF is not related to the crack opening displacement. The SIF is more influenced by the crack opening position and the crack size. Introduction The finite element method has been widely used to study the SIF of the crack tip. Lakkundi [1] used finite element to predict of crack growth in aircraft engine bleed air T-JOINT ducts, found that in a T-joint duct subjected to internal pressure and axial loading, the SIF at the deepest points increases as the crack depth-to-thickness ratio increases. Li [2] used finite element method to do the Numerical analysis of SIF and security service evaluation on thin-walled pipeline's semi-elliptical crack in American Standard Straight Pipe Thread under heat-stress coupling load, concluded that the influence of the thermal composition’s relative difference on KI value is greater than that of other compositions in coupling load. Ismail [3] did the finite element analysis on the stress intensity factor under combined bending and torsion loading, concluded that SIF increased as the crack depth-to-thickness ratio increases under bending loading, for the torsion moment, the SIF is decreased when the depth-to-thickness is increased and these phenomena occurred at the middle position of the circular cross section of the bar. Sultan [4] used finite element to simulate the crack mouth opening displacement (CMOD) of single-edged notched tension (SENT) Specimen and compared with the experimental data, numerical results show that CMODs are in good agreement with experimental data for cases of small crack lengths and lower values of applied load. In this paper, we study on the mechanical properties of ferritic/martensitic steel. The ferritic/martensitic steel (Clam steel) is considered as candidate structural material for future fusion reactors [5]. We calculate the SIF of rectangular clam steel plate with a SENT crack model. The stress intensity factors of different crack locations and different crack lengths are discussed. Theory and calculation method The stress intensity factor and crack mouth opening displacement are obtained by using Ansys software. Detailed finite element analyses are performed on a 2D plane stress model 1-T SENT specimen, having a thickness of 2 mm. The analysis is carried out on the rectangular specimen with length L=60mm and width D=30mm The finite element model and boundary condition are shown in Figure 1. Where, x indicates the distance from the fixed edge to the crack. The crack location is determined by x/L, divided into five groups, we consider x/L as 1/8,1/4,1/2,3/4,7/8 respectively. The crack length is expressed by symbol a, simulation is carried out for 1/15≤a/D≤1/5 which 4th International Conference on Machinery, Materials and Computing Technology (ICMMCT 2016) © 2016. The authors Published by Atlantis Press 1541 corresponds to the crack length of 2mm to 6mm in a total width of 30mm. Fig.1 Single edge cracked finite element model of Clam steel and boundary condition Chemical composition (wt.%) of the clam steel is given in Table.1 . The linear elastic material properties are given as follows, Elastic modulus E=218GPa, Poisson ratio γ=0.33, yield strength σ=514MPa and density ρ=7.78g/cm3. Table1 Chemical composition of CLAM stainless steel(wt./%) Fe Cr Mn W Si V C Ta Ni Bal. 8.82 0.37 1.10 0.005 0.19 0.10 0.068 0.021 In the calculations of the SENT crack model, a mesh refinement is required at the crack tip region due to that the variation of stress and strain fields around the crack tip are very large. Finite element models of the plate with a=2mm,x/L=1/8 is shown in Figure 2 . For the other cracks, the meshes are refined similarly. Fig.2 meshes for clam steel plate with a=2mm, x/L=1/8 The intensity factors are divided into three categories according to the basic type of crack. Model I intensity factor(KI), caused by normal stress perpendicular to the crack plane. Model II intensity factor(KII), caused by shear stress on the leading edge of a vertical crack. Model III intensity factor(KIII), caused by the dislocation of the crack surface is parallel to the leading edge of the crack in its own plane. The effective SIF can be represented as in Eq. (1) .In the way of present loading, the KIII can be considered to be zero. Keff = KI + KII 2 + KIII 2

Finite Element Analysis on the Stress Intensity Factor in SENT Specimen of Clam Steel