The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
R Schirner - One of the best experts on this subject based on the ideXlab platform.
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modified v notched rail shear Test Fixture for shear characterisation of textile reinforced composite materials
Polymer Testing, 2015Co-Authors: Maik Gude, Werner Hufenbach, Manuela Andrich, A Mertel, R SchirnerAbstract:Abstract The V-notched rail shear Test (VNRS) is recognised as a standard Test method for the determination of shear modulus and shear strength of fibre-reinforced composite materials. This method is based on a double V-notched specimen with a large gauge section and an approximately uniform shear stress distribution between the two notches. The construction of the Test device prescribed in standards was revised with the main focus of lines of force as well as precise and economic specimen clamping. Therefore, the modified Test Fixture has been equipped with guide units and the number of clamping bolts could be reduced. The standardised and modified VNRS Fixtures were evaluated using a finite element method. It can be shown that the modified VNRS Test Fixture is well suited for robust and reliable material characterisation of shear property data.
Amir Mosavi - One of the best experts on this subject based on the ideXlab platform.
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Orthotropic mode II shear Test Fixture: Iosipesque modification
Engineering Solid Mechanics, 2019Co-Authors: Nabi Mehri Khansari, Ahmadreza Farrokhi, Amir MosaviAbstract:In-plane strength and constitutive properties of composite materials is known as crucial problems. Although, several studies have been made for obtaining the in-plane mode II properties, the common Test Fixtures are blind in confrontation of shear zone. Furthermore, toughening mechanisms and consequently mode II fracture toughness cannot be evaluated, precisely. Also, proposing the convenient configuration of shear Test Fixture increase the accuracy of evaluation for the shear-zone energy dissipation, especially in orthotropic materials. Hence in the present research, a novel shear Fixture configuration is proposed based on Iosipesque structural modification. Hereof, some arbitrary composite materials (e.g. graphite/epoxy and wood) were studies on the basis of DOE and E-691 ASTM. Furthermore, as the numerical method for indicating the comparison of the uniform and non-uniform shear stress distribution in the modified and common shear Test Fixture, a statistical procedure is used based on ASTM standard in addition to FEM analysis. The obtained results reveal that applying major amendments through the new scheme of the shear Test Fixture, would provide a remarkable precision and a reasonable estimation of the shear strength in comparison with the previous Iosipesque experiments.
Zhou Jianrong - One of the best experts on this subject based on the ideXlab platform.
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pcba printed circuit board assembly plate Test Fixture
2016Co-Authors: Zhou JianrongAbstract:The utility model discloses a PCBA (printed circuit board assembly) plate Test Fixture, including the cuboid tool that bottom plate, upper cover plate, backplate, preceding baffle are constituteed, its characterized in that still includes: support column, support plate, card slot, the support column is installed on the bottom plate, be used for supporting the upper cover plate, the support plate is installed on the bottom plate, the card slot correspondence is seted up the top of support plate, the card slot is seted up on the upper cover plate, the card slot with the limit adjustable horizontally of preceding adjacent one side of baffle. The utility model has the beneficial effects of: the utility model discloses a PCBA (printed circuit board assembly) plate Test Fixture when the PCBA board is put into Test Fixture, gets and puts the convenience, and the PCBA board can not rock in the Testing process, and the atress is even, and reliable and stable, simple structure, convenient to use have improved efficiency of software Testing, have also reduced the manufacturing quantity of tool, save the resource, reduce cost in business.
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pcba board Test Fixture
2015Co-Authors: Zhou JianrongAbstract:The invention discloses a PCBA board Test Fixture, which comprises a cuboid Fixture formed by a bottom board, an upper cover board, a rear baffle, and a front baffle, and is characterized by further comprising supporting columns, carrying boards and board grooves, wherein the supporting columns are arranged on the bottom board for supporting the upper cover board; the carrying boards are arranged on the bottom board; the board grooves are correspondingly arranged above the carrying boards; the board grooves are arranged on the upper cover plate; and the edge at one side where the board groove and the front baffle are adjacent can move horizontally. The PCBA board Test Fixture has the beneficial effects that when the PCBA board is placed in the Test Fixture, taking and placing are convenient, the PCBA board does not shake in the Test process, force is uniform, operation is stable and reliable, the structure is simple, the use is convenient, the Test efficiency is improved, the Fixture manufacturing number is reduced, resources are saved, and the enterprise cost is reduced.
Zhao Ming - One of the best experts on this subject based on the ideXlab platform.
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common pcba printed circuit board assembly plate Test Fixture
2015Co-Authors: Li Yanwu, Zhao MingAbstract:The invention relates to the technical field of electronic industry and particularly relates to a common PCBA (printed circuit board assembly) plate Test Fixture. The PCBA plate Test Fixture comprises a Fixture body, a partition plate and shaft sleeves embedded on left and right side walls of the Fixture body, wherein the shaft sleeves are fixed on the Fixture body by virtue of shaft sleeve pressing blocks; rotary shafts are embedded on the shaft sleeves; one end of a working cavity is fixedly equipped with adapter PCBA plate by virtue of two adapter PCBA plate fixing blocks; the adapter PCBA plate is connected to a to-be-Tested PCBA plate; a carrier plate is arranged at the other end of the working cavity, a floating baffle block is arranged in the inner cavity of the carrier plate, one end of the floating baffle block is resisted against one end surface of the to-be-Tested PCBA plate; the middle end of the rotary shaft is nested on the PCBA plate fixing blocks and the adapter PCBA plate. When the common PCBA plate Test Fixture is used, the manufacturing cost of the Fixture is greatly saved, the mould changing time of the Fixture is also greatly lowered, and the Test efficiency is improved. The common PCBA plate Test Fixture has the advantages of a simple structure, reasonable setting, low manufacturing cost, and the like.
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pcba printed circuit board assembly plate Test Fixture
2015Co-Authors: Li Yanwu, Zhao MingAbstract:The invention relates to the technical field of electronic industry and particularly relates to a PCBA (printed circuit board assembly) plate Test Fixture. The PCBA plate Test Fixture comprises a Fixture body which is equipped with a guide slot, wherein a slide slot hole is formed in the middle of the guide slot, and a plurality of positioning slots are arranged on the two side walls of the guide slot along the length direction; a carrier plate and a floating baffle block are embedded in the guide slot, wherein one end of the floating baffle block is resisted against the end surface of the carrier plate; a handle is further hinged at the bottom end of the Fixture body; the floating baffle block consists of a bottom plate, a floating block, a button and a spring, wherein a bottom column of the floating block penetrates through the slide slot hole and then is fixedly connected to the bottom plate; the button is nested in a floating block fixing hole, and the button is fixedly connected to the inner bottom surface of the floating block by virtue of a spring; and baffle strips matched with the positioning slots are further arranged at the two sides of the button. When the PCBA plate Test Fixture is used, the number of the Fixtures is greatly reduced, the using cost of the Fixture is lowered, the Test efficiency is improved and the Test cost is lowered. The PCBA plate Test Fixture has the advantages of a simple structure, reasonable setting, low manufacturing cost, and the like.
Maik Gude - One of the best experts on this subject based on the ideXlab platform.
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modified v notched rail shear Test Fixture for shear characterisation of textile reinforced composite materials
Polymer Testing, 2015Co-Authors: Maik Gude, Werner Hufenbach, Manuela Andrich, A Mertel, R SchirnerAbstract:Abstract The V-notched rail shear Test (VNRS) is recognised as a standard Test method for the determination of shear modulus and shear strength of fibre-reinforced composite materials. This method is based on a double V-notched specimen with a large gauge section and an approximately uniform shear stress distribution between the two notches. The construction of the Test device prescribed in standards was revised with the main focus of lines of force as well as precise and economic specimen clamping. Therefore, the modified Test Fixture has been equipped with guide units and the number of clamping bolts could be reduced. The standardised and modified VNRS Fixtures were evaluated using a finite element method. It can be shown that the modified VNRS Test Fixture is well suited for robust and reliable material characterisation of shear property data.
