An Experimental Study Of A Stitched Composite With A Notch Subjected To Combined Bending And Tension Loading
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An Experimental Study of a Stitched Composite with a Notch Subjected to Combined Bending and Tension Loading by Susan O. Palmer Pdf
A series of tests was conducted to measure the strength of stitched carbon/epoxy composites containing through-thickness damage in the form of a crack-like notch. The specimens were subjected to three types of loading: pure bending, pure tension, and combined bending and tension loads. Measurements of applied loads, strains near crack tips, and crack opening displacements (COD) were monitored in all tests. The transverse displacement at the center of the specimen was measured using a Linear Variable Differential Transformer (LVDT). The experimental data showed that the outer surface of the pure tension specimen failed at approximately 6,000 microstrain, while in combined bending and tension loads the measured tensile strains reached 10,000 microstrain.
An Experimental Study of a Stitched Composite with a Notch Subjected to Combined Bending and Tension Loading by National Aeronautics and Space Administration (NASA) Pdf
A series of tests was conducted to measure the strength of stitched carbon/epoxy composites containing through-thickness damage in the form of a crack-like notch. The specimens were subjected to three types of loading: pure bending, pure tension, and combined bending and tension loads. Measurements of applied loads, strains near crack tips, and crack opening displacements (COD) were monitored in all tests. The transverse displacement at the center of the specimen was measured using a Linear Variable Differential Transformer (LVDT). The experimental data showed that the outer surface of the pure tension specimen failed at approximately 6,000 microstrain, while in combined bending and tension loads the measured tensile strains reached 10,000 microstrain.Palmer, Susan O. and Nettles, Alan T. and Poe, C. C., Jr.Langley Research CenterCRACK OPENING DISPLACEMENT; EPOXY MATRIX COMPOSITES; NOTCHES; BENDING; CARBON; CRACK TIPS; TRANSFORMERS; COMPOSITE MATERIALS; LOADS (FORCES); TENSILE TESTS; NOTCH TESTS
Experimental, Analytical and Numerical Analyses of Orthotropic Materials and Biomechanics Application by Abdullah Ahmed Alshaya Pdf
The integrity assessment of an engineering structure or member, for instance criteria and fatigue-life predictions, necessitates the knowledge of the full-field individual components of stress, strain and/or displacement. Evaluating these using analytical or numerical techniques can be difficult or impossible for finite structures, contact problems, or if the material properties, loading or boundary conditions are unknown. Such information is often unavailable in practice so as to necessitate experimental approach to capture the exact boundary and loading conditions of the structure. However, extracting individual stress, strain and/or displacement information in the locality of geometric cutouts by purely experimental methods can be difficult and in most cases impossible and often suffer from bad, and in some cases, unavailable results at and close to the edges of cutouts. Combining (or hybridizing) experimental information with analytical and numerical tools enables one to solve aforementioned situations. For example, thermoelastic stress analysis (TSA) is combined with an Airy stress function to stress analyze an orthotropic composite containing an elliptical hole, a rectangular plate subjected to a concentrated edged-load with a near edge hole and a finite plate with a deep U-notch. Utilizing Digital Image Correlation (DIC), values of single displacement component are used here to determine full-field individual components of stresses and displacements in a notched orthotropic composite without explicitly differentiating the measured displacements. The analytical ingredient of this hybrid approach consists of using the Airy stress function which is based on the mechanics foundations of compatibility and equilibrium. The study also emphasizes on reducing stress concentrations and on increasing strength in a side-notched finite-width orthotropic plate by reducing the adjacent structural stiffness through introducing nearby auxiliary notches. The stress and strain concentration factors for a thick plate with a circular hole were also investigated using three-dimensional finite element analysis. A bone surrogate which mimics the bone in strength and geometry was tested experimentally using 3- and 4-point bending and DIC. The major contribution of this thesis is the demonstrated ability to combine experimental, numerical and analytical techniques for the full-field determination of the separate components of stress, strain, and displacement at and in the neighborhood of the cutouts in various loaded components and structures, with different boundary and loading conditions.
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
