توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Determination of Stress Intensity Factors for In–plane Mixed–Mode FractureToughness Tests by Using a New Loading Device
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس دو سالانه بین المللی مکانیک جامدات تجربی، سال
تعداد صفحات: ۷
Determination of materials fracture properties is one of the most important objectives in fracture mechanics and design of structures. In most actual applications, in–plane loading conditions, consists of tensile (mode I), shear (mode II) and combination of tensile and shear modes (mixed–mode). There are various methods for testing fracture specifications of materials. Arcan test fixture is widely used for mixed–mode fracture tests of the isotropic and composite materials because of its simplicity and using of the similar specimens in the experiments. Disadvantages of Arcan fixture such as asymmetry in inplane loading and limitations of changing the angle of loading have been solved by designing and using a new loading device. In this paper, the stress intensity factor functions for pure mode I, mode II and mixed–mode fracture toughness tests are analyzed with finite element method. The results are validated for compact tension (CT) standard specimens.<\div>

۲Elastic–Plastic Mixed–Mode Fracture Analysis of Polypropylene Using NewLoading Device
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس دو سالانه بین المللی مکانیک جامدات تجربی، سال
تعداد صفحات: ۸
In ductile materials the deformation can occur in the plastic zone where the crack tip deformations can no longer be considered small. Linear Elastic Fracture Mechanics (LEFM) is valid only when the inelastic deformation is small compared to the size of the crack, which called small–scale yielding. If large zones of plastic deformation spread before the crack grow, Elastic Plastic Fracture Mechanics (EPFM) must be used. There are many procedures that can be used in EPFM but still the J–integral and the Crack Tip Opening Displacement (CTOD) are generally accepted methods. J–integral is a feasible parameter for describing the fracture of the non–linear elastic materials. Arcan test fixture is widelyused for mixed–mode fracture tests of the isotropic and composite materials. In this research, disadvantages of Arcan fixture such as asymmetry in in–plane loading and limitations of changing the angle of loading have been solved by designing and using a new mixed–mode in–plane loading device. Mixed–mode fracture tests from pure mode I to pure mode II were conducted on Polypropylene (PP) using elastic plastic fracture mechanics analysis. Changes of the J–integral were also investigated numerically via the finite element method for a range of loading angles.<\div>

۳Investigation of Clamp Geometry Effects on the FractureCharacterization by Modified Arcan Fixture
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس دو سالانه بین المللی مکانیک جامدات تجربی، سال
تعداد صفحات: ۶
This study presents investigation of clamp geometry effects on the fracture characterization of the materials by using modified Arcan fixture. In most applications fracture occurs in mode–I (tensile), mode–II (shear), or the combination of shear and tensile modes. In modified Arcan fixture by varying the loading angle,  from 0o to 90o, pure mode–I, pure mode–II and mixed mode data can be obtained. The test fixture and sample were modelled with ABAQUS\CAE and the contour integral method was used at various loading angles to calculate the non–dimensional stress intensity factors. To study the effect of mixed mode loading conditions, the fracture parameters were studied at loading intervals of 3o. By investigating the values of non–dimensional stress intensity factures, a non– uniformity is shown in the values of mode–II non–dimensional stress intensity factures close to pure mode–II loading. By investigating the influence of clamp geometry it was resulted that this non–uniformity was due to the geometry of modified Arcan fixture. This study also investigated the influence of deformation of fixture on the values of fracture parameters. Results showed that by reforming the geometry of modified Arcan fixture the non–uniformity was omitted.<\div>
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