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Mechanics of Structures and Their Analysis
Published in P.K. Jayasree, K Balan, V Rani, Practical Civil Engineering, 2021
P.K. Jayasree, K Balan, V Rani
The stress–strain curve of a particular material represents the distinction of the stress developed in the material with respect to the changes in the strain occurring in it. An example is shown in Figure 5.6. It can be considered as unique because it is different for different materials. It is found out by noting the amount of deformation (strain) experienced by the material at distinct intervals of normal loading (stress).
Stress, Strain, and Material Behavior
Published in Ashwani Bedi, Ramsey Dabby, Structure for Architects, 2019
A stress-strain curve is a plot of stress (along the vertical axis) vs. strain (along the horizontal axis) that helps to visualize important behavioral characteristics of a material under load (Figure 3.3). Every material has a unique stress-strain curve, in tension as well as in compression.
Degradation and Stabilization Issues of Polyethylene in Open air Applications
Published in A. K. Haghi, Ana Cristina Faria Ribeiro, Lionello Pogliani, Devrim Balköse, Francisco Torrens, Omari V. Mukbaniani, Applied Chemistry and Chemical Engineering, 2017
Güneş Boru Izmirli, Sevgi Ulutan, Pinar Tüzüm DEMIR
The relationship between the stress and strain which is presented as the stress-strain curve reveals many of the properties of a material. Usually, the ultimate strength of a material is the stress at or near failure, which is catastrophic with a complete break. However, some materials, especially spherulitic crystalline polymers, reach a point where a large inelastic deformation stress (yielding) occurs, but continue to deform and absorb energy, long beyond that point.35
Mechanical properties of a novel two-phase hybrid plate-lattice metamaterial
Published in Mechanics of Advanced Materials and Structures, 2023
Bingbing Fan, Zhisun Xu, Yongshui Lin, Zhixin Huang
In addition, it is worth noting that the stress-strain curves of the three 3D printed plate-lattice samples under the quasi-static compression test all show similar trends. Referring to Figure 3(f), the three deformation stages can be defined as (i) elastic deformation; (ii) plastic yield. Within the interval the stress-strain curve is approximately a straight line, and this deformation stage is the linear elastic deformation stage. When the stress exceeds the elastic limit and increases to a certain value, the stress remains almost constant or first decreases and then fluctuates slightly, while the strain increases significantly, which is called yield or flow. The yield of the material shows significant plastic deformation, the yield point occurs at the end of the elastic segment of the line and shows a long stress plateau in the stress-strain curve.
Biomechanical and osteointegration study of 3D-printed porous PEEK hydroxyapatite-coated scaffolds
Published in Journal of Biomaterials Science, Polymer Edition, 2023
Chao Wu, Baifang Zeng, Danwei Shen, Jiayan Deng, Ling Zhong, Haigang Hu, Xiangyu Wang, Hong Li, Lian Xu, Yi Deng
The elastic modulus is defined as the slope factor of the stress–strain curve in the elastic deformation stage, which represent the stiffness of the material. The results of solid, porous and porous-HA were plotted in a line chart. The mechanical strength of porous structure decreased compared with that of solid structure (Figure 4a). The slopes of curves in porous and porous-HA were very close, which indicated that their elastic modulus has a good consistency (Figure 4b). The modulus for solid, porous and porous-HA were 1289.43 ± 71.44 MPa, 196.36 ± 9.89 MPa and 183.29 ± 7.71 MPa, respectively. The compressive strength for solid, porous and porous-HA were 107.24 ± 5.15 MPa, 33.12 ± 3.86 MPa and 29.99 ± 4.16 MPa, respectively. The quantitative analysis showed no statistical difference in modulus and compressive strength between the porous and porous-HA groups (p > 0.05), which indicated that significant changes of the biomechanical properties did not occur while the HA coating was performed on the porous PEEK material.
Synthesis and characterisation of natural ceramic reinforced Titanium Metal Matrix composite
Published in Canadian Metallurgical Quarterly, 2021
Compression test is used to study how a material behaves under applied crushing load. This test is performed by applying a compressive pressure to the material specimen. This test provides significant information to characterise material's response to loading on a universal testing machine. Stress–strain curve is a significant graphical measure of a material’s mechanical behaviour. This curve provided significant information about the mechanical properties of the composite. The stress–strain curve obtained for the titanium composite is as shown in Figure 5. The stress–strain curve shows 10.32 mm maximum displacement at compressive stress 387.52 MPa. Initially, stress strain curve shows linear relationship between stress and strain. In this stage, as the curve indicates, the specimen is able to retain its original shape if the load is removed. The elastic range of titanium composite on stress strain curve continues up to 390 MPa (maximum compressive strength). The slope of the curve in this elastic region gives the modulus of elasticity. The modulus of elasticity of the composite increases with the increase in its strength. Maximum compressive strength of ultra-pure titanium metal is 170 MPa [23,25]. This confirms that due to the introduction of silica reinforcement the compressive strength of material increases significantly.