Failure Behavior of Wood (Japanese cypress) under Combined Axial Force and Torque. Effects of Loading Method and Loading Path.

To study the experimental method of axial compressive test of concrete columns in service strengthened with bonding FRP(fiber reinforced plastic), the post-tensioned pre-stressing method was employed to exert initial stress to the specimens before bonding FRP, Then FRP was bonded. Axial loading method of the specimens was that one main jack exerted axial force and two jacks provided stiffness for the specimens. In this way the complete stress-strain curves of specimens was obtained. The results indicated the technical target of axial compressive test of in service concrete columns strengthened with FRP was greatly achieved by using this experimental method.

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Dynamic Behavior of a Clamped Plastic Beam With Cracks at Supporting Ends Under Impact

Journal of Pressure Vessel Technology ◽

10.1115/1.2883723 ◽

1999 ◽

Vol 121 (4) ◽

pp. 406-412 ◽

Cited By ~ 8

Author(s):

F. L. Chen ◽

T. X. Yu

Keyword(s):

Axial Force ◽

Complete Solution ◽

Bending Moment ◽

Deformation Energy ◽

Failure Behavior ◽

J Integral ◽

Rigid Plastic ◽

The Stability ◽

Complementary Equation ◽

Initial Cracks

This paper examines a projectile impact on a rigid-plastic beam with cracks at the fully clamped ends. By assuming the cracked sections yield immediately after impact, a three-hinge/two-hinge mechanism for the response process is constructed so that a complete solution considering the interaction between bending moment M and axial force N is derived. The key of the formulation is to find a complementary equation concerning the axial force N. To predict accurately the stability of the initial cracks, the J-integral criterion is extended to involve the contribution of the axial force. All the governing equations are nondimensionalized and rearranged, ready for Runge-Kutta integration procedure. The numerical results demonstrate that the mass ratio and the axial force have significant influence on the final deformation, energy partition, and the value of J-integral near the crack tip. The J-integral is not very sensitive to the depth of the initial cracks, but the presence of initial cracks in a beam may alter the failure behavior of the beam after impact, that is, from a strength-type failure to a fracture-type failure.

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Effect of Web Stiffeners on The Flexural Behavior of Composite GFRP- Concrete ‎Beam Under Impact Load

Journal of Engineering ◽

10.31026/j.eng.2021.03.06 ◽

2021 ◽

Vol 27 (3) ◽

pp. 76-92

Author(s):

Safaa Ibraheem Ali ◽

Abbas A. Allawi

Keyword(s):

Impact Load ◽

Damping Ratio ◽

Experimental Studies ◽

Local Buckling ◽

Structural Response ◽

Point Load ◽

Flexural Behavior ◽

Elastic Behavior ◽

Loading Path ◽

Failure Behavior

In this paper, numerical and experimental studies on the elastic behavior of glass fiber reinforced ‎polymer (GFRP) with stiffeners in the GFRP section's web (to prevent local buckling) are presented. ‎The GFRP profiles‎ were connected to the concrete deck slab by shear connectors. Two full-scale simply supported ‎composite beams (with and without stiffeners) were tested under impact load (three-point load) to ‎assess its structural response. The results ‎proved that the maximum impact force, maximum ‎deflection, damping time, and ‎damping ratio of the composite beam were affected by the GFRP ‎stiffeners‎. The experimental results indicated that the damping ratio and deflection were diminished compared to hybrid beam without stiffeners by ‎‎16% and 22%, respectively, and increasing damping time‏ by 26%. Finite element models were used to study pre-failure behavior. ‎ The numerical modeling results showed good agreement with experimental data in terms of loading path and ‎final load. The damping ratio and midspan deflection values were greater than the experimental ‎values by 6% and 12%, respectively.

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Experimental Study on Failure Estimation Method for Circumferentially Cracked Pipes Subjected to Multi-Axial Loads

Volume 1A: Codes and Standards ◽

10.1115/pvp2015-45524 ◽

2015 ◽

Author(s):

Yinsheng Li ◽

Kunio Hasegawa ◽

Naoki Miura ◽

Katsuaki Hoshino

Keyword(s):

Axial Force ◽

Nuclear Power ◽

Power Plants ◽

Structural Integrity ◽

Estimation Method ◽

Bending Moment ◽

Estimation Methods ◽

Failure Behavior ◽

Axial Loads ◽

Torsion Moment

When a crack is detected in a piping line during in-service inspections, failure estimation method provided in ASME Boiler and Pressure Vessel Code Section XI or JSME Rules on Fitness-for-Service for Nuclear Power Plants can be applied to evaluate the structural integrity of the cracked pipe. The failure estimation method in the current codes accounts for the bending moment and axial force due to pressure. The torsion moment is not considered. Recently, analytical investigations have been carried out by several authors on the limit load of cracked pipes considering multi-axial loads including torsion and two failure estimation methods for multi-axial loads including torsion moment with different ranges of values have been proposed. In this study, to investigate the failure behavior of cracked pipes subjected to multi-axial loads including the torsion moment and to provide experimental support for the failure estimation methods, failure experiments were performed on 20 mm diameter stainless steel pipes with a circumferential surface crack or a through-wall crack under combined axial force and bending and torsion moments. Based on the experimental results, the proposed failure estimation methods were confirmed to be applicable to cracked pipes subjected to multi-axial loads.

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Experimental Study on Failure Estimation Method for Circumferentially Cracked Pipes Subjected to Multi-Axial Loads

Journal of Pressure Vessel Technology ◽

10.1115/1.4033531 ◽

2016 ◽

Vol 139 (1) ◽

Cited By ~ 2

Author(s):

Yinsheng Li ◽

Kunio Hasegawa ◽

Naoki Miura ◽

Katsuaki Hoshino

Keyword(s):

Axial Force ◽

Nuclear Power ◽

Power Plants ◽

Structural Integrity ◽

Estimation Method ◽

Bending Moment ◽

Estimation Methods ◽

Failure Behavior ◽

Axial Loads ◽

Torsion Moment

When a crack is detected in a piping line during in-service inspections, failure estimation method provided in ASME Boiler and Pressure Vessel Code Section XI (ASME Code Section XI) or JSME Rules on Fitness-for-Service for Nuclear Power Plants (JSME FFS Code) can be applied to evaluate the structural integrity of the cracked pipe. The failure estimation method in the current codes accounts for the bending moment and axial force due to pressure. The torsion moment is not considered. Recently, analytical investigation was carried out by the authors on the limit load of cracked pipes considering multi-axial loads including torsion. Two failure estimation methods for multi-axial loads including torsion moment with different ranges were proposed. In this study, to investigate the failure behavior of cracked pipes subjected to multi-axial loads including the torsion moment and to provide experimental support for the failure estimation methods, failure experiments were performed on 20 mm diameter stainless steel pipes with a circumferential surface crack or a through-wall crack under combined axial force, bending moment, and torsion moment. Based on the experimental results, the proposed failure estimation methods were confirmed to be applicable to cracked pipes subjected to multi-axial loads.

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Effect of Lading Method on the Elastic Properties of Wood (Japanese cypress) under Combined Axial Force and Torque.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.66.2144 ◽

2000 ◽

Vol 66 (652) ◽

pp. 2144-2150 ◽

Cited By ~ 1

Author(s):

Mariko YAMASAKI ◽

Yasutoshi SASAKI

Keyword(s):

Elastic Properties ◽

Axial Force ◽

Japanese Cypress

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The Basic Research on Numerical Simulation of Bimetal Composited T-Tube through Hydraulic Bulging

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.278-280.487 ◽

2013 ◽

Vol 278-280 ◽

pp. 487-490 ◽

Cited By ~ 5

Author(s):

Hui Feng Wang ◽

Jing Tao Han ◽

Zhang Hui

Keyword(s):

Numerical Simulation ◽

Frictional Force ◽

Basic Research ◽

Loading Path ◽

Metal Tube ◽

T Tube ◽

Loading Method ◽

Clad Tube ◽

Bimetal Tubes ◽

Hydraulic Bulging

Bimetal composited tube is constituted by two different metals. Comparing with single metal tube, composited tube can make the best of optimum performance of based tube and clad tube. In present research, straight bimetal tubes were taken as the objectives and have been studied deeply. A new hydroform process is introduced in this paper, which can be used to form bimetal composited special tubes. Loading path, loading method, deformation of material, influence of frictional force etc. are studied using numerical simulation fully and the key technique and specialty of this technology were gained. Through simple equipment bimetal composited T-tube has been prepared.

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