Equivalent stress-strain law for embedded reinforcements considering bond-slip effects

2018 ◽  
Vol 165 ◽  
pp. 247-253 ◽  
Author(s):  
José Ramón Díaz de Terán ◽  
Vladimir G. Haach
Keyword(s):  
Equivalent Stress ◽  
Stress Strain ◽  
Bond Slip ◽  
Slip Effects

Measurement of Stress-strain Curves of PECVD Silicon Oxide Thin Films by Means of Nanoindentation

2006 ◽  
Vol 977 ◽  
Author(s):  
Zhiqiang Cao ◽  
Xin Zhang
Keyword(s):  
Thin Films ◽  
Plastic Deformation ◽  
Deformation Mechanism ◽  
Silicon Oxide ◽  
Equivalent Stress ◽  
Plasticity Theory ◽  
Stress Strain ◽  
Transformation Zone ◽  
Shear Transformation ◽  
Shear Transformation Zone

AbstractIn this paper, we explore the use of nanoindentation techniques as a method of measuring equivalent stress-strain curves of the PECVD SiOx thin films. Three indenter tips with different geometries were adopted in our experiments, enabling us to probe different regimes of plastic deformation in the PECVD SiOx thin films. A shear transformation zone (STZ) based amorphous plasticity theory is applied to depict the underlying plastic deformation mechanism.

Stress–Strain Analysis of a Pipeline With Inner and Outer Corrosion Defects

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Zheng Liang ◽  
Yao Xiao ◽  
Jie Zhang
Keyword(s):  
Outer Surface ◽  
Strain Distribution ◽  
Surface Defect ◽  
Equivalent Stress ◽  
Strain Analysis ◽  
Local Defect ◽  
Stress Strain ◽  
Defect Type ◽  
Single Defect ◽  
Inner Surface

A numerical simulation method is adopted to analyze the effects of three types of defect geometries ((1) a single defect on the inner surface, (2) a single defect on the outer surface, and (3) double coaxial defects on the inner surface and the outer surface.) on the residual strength of corroded X60 steel pipelines and equivalent stress and plastic strain distribution of the local defect area. The results show that the defect geometry exerts obvious effects on stress–strain distribution. The earliest plastic deformation occurs at the edge of the inner surface defect (type 1), but it occurs on the central part of both the outer surface defect (type 2) and the double defects (type 3). The appearance of defects greatly weakens the stability of the pipeline. For equivalent sum total corrosion defect depth, a single defect is more harmful to the pipeline than double defects.

Experimental study on low-strength concrete joint core strengthened with steel meshes for connecting PFCC column and RC beam

2020 ◽  
pp. 136943322096902
Author(s):  
Feng Yu ◽  
Chaochao Feng ◽  
Yuan Fang ◽  
Qiqi Liu ◽  
Yi Hu ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Superposition Principle ◽  
Equivalent Stress ◽  
Volume Ratio ◽  
Ultimate Bearing Capacity ◽  
Confined Concrete ◽  
Fe Model ◽  
Rc Beam ◽  
Stress Strain ◽  
Steel Mesh

This paper presented a new joint core strengthened with multi-layer steel meshes for connecting the PVC-FRP Confined Concrete (PFCC) column and Reinforce Concrete (RC) beam. Seven specimens were tested under concentric compression and the effects of several parameters including the height, diameter of specimen and volume ratio of steel mesh on the compressive behaviors were investigated. Test results showed that all the reinforcement yielded successively and eventually the crushing of the concrete dominated the failures of specimens. The ultimate bearing capacity and ultimate equivalent axial strain decreased as the height of specimen increased, while they increased as the diameter of specimen or the volume ratio of steel mesh increased. The ultimate strains of all the reinforcement and concrete increased as the height of specimen increased while they decreased as the diameter of specimen or the volume ratio of steel mesh increased. Considering the influence of height of specimen, a modified formula for conveniently predicting the ultimate bearing capacity of the joint core strengthened with steel meshes was proposed based on the theory of confined concrete and superposition principle of multiple confinement. The predicted results were in good agreement with the experimental data. Additionally, an equivalent stress–strain relationship model of the joint core strengthened with steel meshes was suggested based on the experimental research. The predicted curves agreed well with the measured equivalent stress–strain curves. Moreover, a validated Finite Element (FE) model for the joint core strengthened with steel meshes was developed to conduct parametric studies, which broadened the available experimental results about the mechanical performances of the joint.

scholarly journals Influence of Circumferential Placement Position of Guide Vanes on Performance and Dynamic Characteristics of Nuclear Reactor Coolant Pump

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Xiaorui Cheng ◽  
Boru Lv ◽  
Chenying Ji ◽  
Ningning Jia ◽  
Dorah N
Keyword(s):  
Nuclear Reactor ◽  
Guide Vane ◽  
Equivalent Stress ◽  
Hydraulic Loss ◽  
Stress Strain ◽  
Coolant Pump ◽  
Guide Vanes ◽  
Reactor Coolant ◽  
Maximum Equivalent Stress ◽  
Exit Edge

In order to study the influence of the circumferential placement position of the guide vane on the flow field and stress-strain of a nuclear reactor coolant pump, the CAP1400 nuclear reactor coolant pump is taken as the research object. Based on numerical calculation and test results, the influence of circumferential placement position of the guide vane on the performance of the nuclear reactor coolant pump and stress-strain of guide vanes are analyzed by the unidirectional fluid-solid coupling method. The results show that the physical model and calculation method used in the study can accurately reflect the influence of the circumferential placement position of the guide vane on the nuclear reactor coolant pump. In the design condition, guide vane position has a great influence on the nuclear reactor coolant pump efficiency value, suction surface of the guide vane blade, and the maximum equivalent stress on the hub. However, it has a weak effect on the head value, pressure surface of the guide vane blade, and the maximum equivalent stress on the shroud. When the center line of the outlet diffuser channel of the case is located at the center of the outlet of flow channel of the guide vane, it is an optimal guide vane circumferential placement position, which can reduce the hydraulic loss of half of the case. Finally, it is found that the high stress concentration area is at the intersection of the exit edge of the vane blade and the front and rear cover, and the exit edge of the guide vane blade and its intersection with the front cover are areas where the strength damage is most likely to occur. This study provides a reference for nuclear reactor coolant pump installation, shock absorption design, and structural optimization.

Crack Width Calculation of Steel Reinforced Concrete Beams Considering the Bond-Slip

2012 ◽  
Vol 166-169 ◽  
pp. 1395-1398
Author(s):  
Cao Xiu Li ◽  
De Jian Shen ◽  
Pei Ling He ◽  
Xian Feng Dong ◽  
Hong Fei Zhang
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Crack Width ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
The Other ◽  
Bond Slip ◽  
Steel Reinforced Concrete ◽  
Slip Effects ◽  
Current Standards

Bond-slip performance between section steel and concrete has effect on crack width of steel reinforced concrete（SRC）beams based on experimental results. Current standards about SRC structures do not involve bond-slip effects when calculating the crack width of SRC beams, and this is not valid exactly . This article describes a new method of crack width calculation for SRC beams, which considering the bond-slip effects on crack width. Crack width of SRC beams are divided into two parts: one part ignoring the bond-slip between steel and concrete, and the other part considering additional crack width caused by the bond-slip. The total crack width is the sum of the two parts. Results show that the proposed method in this article is coincide with experimental study.

Sign in / Sign up

Export Citation Format

Share Document