Moises Jimenez Moises Jimenez Additional information is available at the end of the chapter

[37] Zheng X, Cui H, Su X, Engler-Pinto Jr CC, Wen W. Numerical modeling of fatigue crack propagation based on the theory of critical distances. Engineering Fracture Mechanics.

[38] Proudhon H, Li J, Wang F, Roos A, Chiaruttine V, Forest S. 3D simulation of short fatigue crack propagation by finite element crystal plasticity and remeshing. International Jour-

[39] Roshdy SB. Triangular quarter-point elements as elastic and perfectly-plastic crack tip elements. International Journal for Numerical Methods in Engineering. 1977;11(11):85-98

[40] Chen LS, Kuang JH. A modified linear extrapolation formula for determination of stress

[41] Lin XB, Smith RA. An improved numerical technique for simulating the growth of planar fatigue cracks. Fatigue and Fracture of Engineering Materials and Structures. 1997;20(10):

[42] He WJ, Lin Y, Ding HJ. A three-dimensional formula for determining stress intensity factors in finite element analysis of cracked bodies. Engineering Fracture Mechanics.

[43] Xiao QZ, Karihaloo BL. Direct evaluation of accurate coefficients of the linear elastic crack tip asymptotic field. Fatigue & Fracture of Engineering Materials & Structures. 2003;26(8):

intensity factors. International Journal of Fracture. 1992;54(1):3-8

2013;114:151-165

252 Contact and Fracture Mechanics

1363-1373

719-729

1997;57(4):409-415

nal of Fatigue. 2016;82:238-246

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/intechopen.72640

#### **Abstract**

The reduced time available for product development has forced original equipment manufacturers and their suppliers to develop new components and subsystems efficiently, to release it to the market with lightweight and innovate designs, guaranteeing non-failure on the service life. In order to reach these goals, accelerated tests are developed to evaluate its durability with different design proposals. Although durability is nowadays improved through virtual testing, it is mandatory to perform experimental tests before the final release of the product. The tests are done not only to reproduce the same loads; it has to be modified to reproduce the failures that are found on the roads under normal use conditions. The component can be evaluated as itself, in subassembly or in the assembly; the result among these possibilities have to be the same. To reach this aim, devices are designed to reproduce a specific stiffness, combining its mechanical behavior with the modified loads also known as spectrum. Accelerated test can be developed to increase its severity, reducing test time. The spectrum to perform the durability test was built with service loads and different profiles or users and different roads including weather conditions.

**Keywords:** accelerated tests, durability, spectrum, extrapolated tests, statistical analysis
