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1	STRAIN CONCENTRATION AND TENSION DOMINATED STIFFENED AEROSPACE STRUCTURES Lam, Daniel F. 18 May 2006 (has links) No description available. open hole Average K-values inch and widths K-values inch widths failure strain
2	A Comparative Analysis of the Biomechanics and Biochemistry of Cell-Derived and Cell-Remodeled Matrices: Implications for Wound Healing and Regenerative Medicine Ahlfors, Jan-Eric Wilhelm 03 May 2004 (has links) The purpose of this research was to study the synthesis and remodeling of extracellular matrix (ECM) by fibroblasts with special emphasis on the culture environment (media composition and initial ECM composition) and the resulting mechanical integrity of the ECM. This was investigated by culturing fibroblasts for 3 weeks in a variety of culture conditions consisting of collagen gels, fibrin gels, or media permissive to the self-production of ECM (Cell-Derived Matrix), and quantifying the mechanics of the resulting ECM. The mechanical characteristics were related to the biochemistry of the resulting ECM, notably in terms of collagen accumulation and collagen fibril diameters. The ultimate tensile strength (UTS) of the collagen gels and fibrin gels at the end of the 3-week period was 168.5 ± 43.1 kPa and 133.2 ± 10.6 kPa, respectively. The ultimate tensile strength of the cell-derived matrices was 223.2 ± 9 kPa, and up to 697.1 ± 36.1 kPa when cultured in a chemically-defined medium that was developed for the rapid growth of matrix in a more defined environment. Normalizing the strength to collagen density resulted in a UTS / Collagen Density in these groups of 6.4 ± 1.9 kPa/mg/cm3, 25.9 ± 2.4 kPa/mg/cm3, 14.5 ± 1.1 kPa/mg/cm3, and 40.0 ± 1.9 kPa/mg/cm3, respectively. Cells were synthetically more active when they produced their own matrix than when they were placed within gels. The resulting matrix was also significantly stronger when it was self-produced than when the cells rearranged the matrix within gels that corresponded to a significantly larger fraction of non-acid and pepsin extractable collagen. These studies indicate that cell-derived matrices have potential both as in vitro wound healing models and as soft connective tissue substitutes. tension failure strain mechanics fibroblasts regenerative medicine serum-free UTS proteoglycans thickness glycosaminoglycans extensibility collagen wound-healing model cell-remodeled matrix cell-derived matrix fibroblast-populated collagen gel biomechanical characterization fibrin gel strength chemically-defined medium growth factors tissue growth tissue regeneration total protein content human tissue formation biochemical characterization Extracellular matrix Fibroblasts Biomechanics Biochemistry Wound healing
3	圧縮と曲げを受ける鋼部材セグメントの終局ひずみと鋼アーチ橋の動的耐震照査への応用葛, 漢彬, GE, Hanbin, 河野, 豪, KONO, Takeshi, 宇佐美, 勉, USAMI, Tsutomu 03 1900 (has links) No description available. Dynamic verification procedure 動的耐震照査法 failure strain 終局ひずみ large axial force ratio 大軸力比 seismic performance 耐震性能 steel arch bridge 鋼アーチ橋 steel member 鋼部材
4	Characterisation of an Additively Manufactured Self-Sensing Material Using Carbon Fibre Sensors Williamson, Alain January 2023 (has links) Increasing demand for structural health monitoring in space highlights the need to make the creation of these systems more accessible. This study investigates the potential of additive manufacturing to achieve this goal by characterizing a self-sensing material made of a commercially available 3D-printed continuous carbon fibre filament. The results demonstrate the feasibility of converting the filament into a strain sensor with improved sensitivity compared to conventional foil strain gauges. Mechanical and electromechanical properties of the self-sensing material were characterized, including an ultimate tensile strength of 45.09 ± 3.45 MPa, a failure strain of 38.93 ± 3.41%, and a base resistance of 759.11Ω. The tensile gauge factor was calculated to be 467.06 ± 375.90 within the strain range of 0% to 3.8% with a linearity (R2) of 0.93. For the first time, a systematic literature review compares mechanical and electromechanical properties to enable material selection for mechanical design incorporating self-sensing material. The study highlights that the spread of material properties in a group of materials indicates how well-developed a material is for self-sensing purposes. This study advances our understanding of the feasibility of using additive manufacturing to create self-sensing materials for structural health monitoring systems and opens up new avenues for further research. Additive Manufacturing Self-Sensing Material Carbon Fibre Sensors Structural Health Monitoring Space Applications Strain Sensor Mechanical Properties Electromechanical Properties Tensile Strength Failure Strain Base Resistance Gauge Factor Linearity Systematic Literature Review Material Selection Mechanical Design Material Development Feasibility Study Composite Science and Engineering Kompositmaterial och -teknik Other Materials Engineering Annan materialteknik Bearbetnings-, yt- och fogningsteknik

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