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The Cohesive Segments Method [15] The approach within the framework of XFEM is based on traction-separation cohesive behavior, which can be used to simulate crack initiation and propagation along an arbitrary, solution-dependent path in the bulk materials, since the crack propagation is not tied to the element boundaries in a mesh.
Firstly the elastic material mechanics is employed in the model to simulate with the elastic material model, in which the maximum principle stress is carried out as show in the Fig 7.
However, there is a considerable zone in which the maximum principal stress value is greater than the material strength.
And this Project is also financially supported by the National Natural Science Foundation of China (Grant No. 51179140).
Discrete fracture in quasi-brittle materials under compressive and tensile stress states.

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Economical and fewer materials needed. 3.
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The Chinese poplar was used as the raw material in this study.
Alkaline lignin was applied to agriculture and forestry, oil industry, high polymer material and so on.
Experimental Materials .
Journal of Pulp and Paper Science, 2002,28(2):50-54
[3] S Wu, DS Argyropoulos., An improved method for isolating lignin in high yield and purity, Journal of Pulp and Paper Science, 2003, 29 (7): 235-240

The middle layer was the risk influence factors including the slope geometric characteristics, slope failure condition, water infiltration condition and slope materials.
The four indexes were named respectively as the slope geometric characteristics A, slope failure condition B, water infiltration condition C and slope materials D.
Table 7 The value of the foundation layer index in slope materials The foundation layer index of slope materials Weight (Wi) Value Slope materials D 1.0 40 The score of soil slope stability can be got according to the weight of the middle layer and the foundation layer indexes.
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Niihara, Annealing effects on structure and mechanical properties of CoCrFeNiTiAlx high-entropy alloys, Materials Science and Engineering, 20 (2011) 012009

Introduction With the development of modern science and technology, many new non-metallic materials with excellent performance are applied in bridge engineering.
In many FRP materials, the material performance of the CFRP is most prominent.
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Acknowledgements This work was financially supported by the Natural Science Foundation of China (51078062).
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