A two dimensional finite MODEl with inclined crack at different crack angles are being analyzed in MIXED MODE condition using photo elasticity method for the determination of Stress Intensity Factors. The well-known Sih’s equation and three points deterministic approach is used for the determination of stress intensity factors. The effects of biaxial load factor, crack angle, size factors were studied and a regression MODEl was developed for geometry correction to predict Stress Intensity Factors. The results give a good compromise to the theoretical one. The experimental result also gives significant data for the two dimensional MIXED MODE loading conditions.

In this paper a very fast 4-2 compressor is introduced. Considering the fact that technological miniaturization is going to reach to its physical limits, there is no way except presenting new approaches and using new architectures. In this design we have improved the overall speed of the system using combined voltage and current MODE circuits. All the simulation are done based on BSIMv3 and .25 urn technology. We have used Hspice and CosMos-Scope tools. The input patterns are generated and applied with MATLAB. According to the simulations, the proposed circuit has demonstrated significant improvement in terms of speed and power dissipation. The parameter used to compare the simulations reseals is PDP (power delay product). The other factor in order to compare these two designs is the number of transistors used. The proposed design illustrates 20% reduction in the transistor count.

In this paper, the MIXED MODE experimental results of 24 notched beams of concrete with various notch depths and locations are reported. The test results for conventional critical stress intensity factors and crack trajectories are demonstrated. It is noted that with the larger thickness, which results in conditions closer to plane strain, the crack path can be better predicted by linear elastic fracture mechanics criteria. The effects of applied load and specimen weight on the fracture are considered with the use of separate stress intensity factors. It is observed that the final failure angles, based on the crack path's intersection point with the beam's top side, are better predicted than the crack initiation angles, from the maximum principal stress criterion. Conventional MIXED MODE fracture toughness increases with an increase in the MODE II to MODE I stress intensity factors ratio.

The linear elastic fracture phenomenon has been characterized with stress intensity factors (SIFs). In this study a general function is obtained in order to predict the fracture parameters. Numerical calculation of the SIFs in a MIXED-MODE condition is a cumbersome task. In this research, more than 6800 numerical analyses using extended finite element method are conducted to simulate the fracture problem. States are considered for a plate with an arbitrary edge or center crack. MIXED MODE SIFs were calculated using of interaction integral. Then, Gene Expression Programming (GEP) method is utilized to extraction of a function. Results show acceptable correlations between numerical calculations and genetic programming functions. R-square (R2) values are in a range of 0. 91 to 0. 96 that guarantees the accuracy of the inferred functions.

In the case of explosions and fires, the rocks undergo a cycle of heating and cooling. For that, first, they are exposed to considerable heat and then cooled after extinguishing the fire. Temperature variations and subsequent contraction and expansion affect the physical and mechanical properties of rocks. Through two series of tests, the effects of temperature and the number of heating-cooling cycles on the MODE I, MODE II and the effective MIXED-MODE I-II fracture toughness of Lushan sandstone were investigated. In the first series, the effect of temperature was studied in a heating– cooling cycle at ambient temperature (25° C) and 60, 150, 200, 300, 500, and 700° C. The highest and lowest MODE I, MODE II and the effective MIXED-MODE I-II fracture toughness were, observed at 150 and 700° C, respectively. In the second series of tests, the effect of the number of heating– cooling cycles was investigated on the MODE I, MODE II and the effective MIXEDMODE I-II fracture toughness of sandstone specimens at 150° C (for hydraulic fracturing MODEling) and a crack inclination angle of 45° . According to the results, the MODE I, MODE II and the effective MIXED-MODE I-II fracture toughness increased in the first cycle and decreased with increasing the number of heating– cooling cycles. As the crack inclination increased, the effective MIXED-MODE I-II fracture toughness of the sandstone specimens increased. The MODE II fracture toughness increased up to a crack inclination angle of 45° and then decreased. Moreover, the MODE of fracture changes from opening MODE (MODE I) at the crack inclination angle of zero degree to MIXED MODE (tension-shear) at the crack inclination angle of less than 28. 8° . The MODE of fracture changes from tensile-shear to compression-shear at the crack inclination angle of greater than 28. 8° .

Many research studies have been performed on forced convection (active) solar dryers for fruit and vegetables. A short survey of these showed that applying the forced convection solar dryer not only significantly reduced the drying time but also resulted in many improvements in the quality of the dried products. Active indirect and MIXED-MODE thin layer solar drying experiments were conducted on Sultana grapes. A combination of a solar air heater and a cabinet dryer was designed, constructed and tested for this product in the Agricultural Engineering Department at Shiraz University, Iran. Three air flow rates (0.085, 0.126 and 0.171 m3 s-1) and two types of drying systems (indirect and MIXED-MODE) were adopted. The south wall of the drying chamber was covered by a sheet of glass for MIXED-MODE and the glass sheet was covered with a thick sheet of cloth for an indirect solar drying system. Seven well-known thin layer drying MODEls were used separately to fit the MIXED-MODE and indirect type experimental data for Sultana grapes. For experimental indirect data, the Modified Page MODEl (r=0.998, X2= 0.000241) and for experimental MIXED-MODE data, the Page MODEl (r=0.999, X2= 0.000169) showed the best curve fitting results with highest r (correlation coefficient) and lowest X2 (reduced chisquare) values. The constants in these MODEls explain the effects of drying parameters, air velocity and temperature. To take account of these effects, the best correlation equations between the constants and drying parameters were also introduced using multiple regression analysis.

Failures in composite materials occur mainly due to interlaminar fracture, also called delamination, between laminates. This indicates that characterizing interlaminar fracture toughness is the most effective factor in the fracture of composite materials. This study reports investigation on MIXED-MODE interlaminar fracture behaviour in woven carbon fibre/polyetherimide (CF/FEI) thermoplastic composite material based on experimental and numerical analyses.Experiments were conducted using the special test loading device. By varying the loading angle,α from 0º to 90º, pure MODE-I, pure MODE-II and a wide range of MIXED-MODE data were obtained experimentally. Using the finite-element results, geometrical factors were applied to the specimen. Based on experimentally measured critical loads, MIXED-MODE interlaminar fracture toughness for the composite under consideration determined. The fracture surfaces were examined by scanning electron microscopy to gain insight into the failure responses.

Automatic crack propagation and stable fatigue crack growth as complicate problems in fracture mechanics are studied. In this study The Extended Finite Element Method (XFEM) is utilized because of several drawbacks in standard finite element method in crack propagation MODEling. Estimated Crack paths are obtained by using Level Set Method (LSM) in coupling with XFEM for 2D MIXED MODE crack propagation problems. Stress intensity factors for MIXED MODE crack problems are numerically calculated by using interaction integral method completely based on familiar path independent J-integral method. Different crack path growths are shown for different types of boundary conditions. Also, stable fatigue crack growth due to numerous cycles of loading using Paris law is presented. Finally, some experimental results and analytical solutions for stress intensity factors are concerned to guarantee the numerical estimated crack path growths and stress intensity factors respectively.