Nonlinear Deformation Behavior of New Braided Composites with Six-axis Yarn Orientations

2011 ◽  
Author(s):  
H.-C. Ahn ◽  
W.-R. Yu ◽  
Z. Guo
Keyword(s):  
Deformation Behavior ◽  
Nonlinear Deformation ◽  
Braided Composites

Investigation of Compressive Damage Mechanisms in 3D Braided Composites by the Acoustic Emission Events Energy and Amplitude

2013 ◽  
Vol 274 ◽  
pp. 393-397 ◽  
Author(s):  
Shi Yan ◽  
Shi Dong Pan ◽  
Dong Hua Li ◽  
Ji Cai Feng
Keyword(s):  
Acoustic Emission ◽  
Deformation Behavior ◽  
Compressive Loading ◽  
Damage Mechanism ◽  
Braided Composites ◽  
Damage Mechanisms ◽  
3D Braided Composites ◽  
Damage Process ◽  
Compressive Damage ◽  
Fracture Growth

The deformation behavior and damage mechanism of 3-D carbon/epoxy braided composites with different braiding angles under the monotonic compressive loading are investigated by the acoustic emission (AE) technique. The damage process is divided into several different regions based on the change of the accumulative AE event counts. Correlations between the damage mechanisms and the AE results are established in terms of the events energy and amplitude. These correlations can be used to monitor the fracture growth process in the braided composites. Experimental results reveal that the AE technique is an effective tool for identifying damage mechanisms.

Nonlinear Deformation Behavior of Clamped Bolted Joints Under a Separating Service Load

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Sayed A. Nassar ◽  
Xianjie Yang ◽  
Satya Vijay Teja Gandham ◽  
Zhijun Wu
Keyword(s):  
Finite Element ◽  
Deformation Behavior ◽  
Nonlinear Deformation ◽  
Bolted Joints ◽  
Bolted Joint ◽  
Element Analysis ◽  
Analysis Study ◽  
Linear Elastic ◽  
Service Load ◽  
Interface Contact

The nonlinear deformation behavior of clamped bolted joints under a separating service load is investigated using finite element and experimental techniques. Although the materials for the bolted joint remain in the linear elastic range, the interface contact area between the clamped plates is sensitive to both the magnitude and the location of the separating force. This often causes nonlinear deformation behavior of the bolted joint. This finite element analysis study investigates the variation in the tension of a tightened bolt and the corresponding change in the joint clamp load due to a separating service load that is placed at various distances from the bolt center. The separating force is symmetrically placed at locations (from the bolt center) that are equal to 3–5 times the nominal diameter of the bolt. Experimental verification of the finite element results is provided.

Nonlinear Deformation Behavior of Bolted Flanges Under Tensile, Torsional, and Bending Loads

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Zhijun Wu ◽  
Sayed A. Nassar ◽  
Xianjie Yang
Keyword(s):  
Finite Element ◽  
Deformation Behavior ◽  
Nonlinear Deformation ◽  
Dynamic Strength ◽  
External Loading ◽  
Element Analysis ◽  
Axial Tensile ◽  
Element Simulation ◽  
Bending Loads ◽  
Bolted Flange

A bolted flange may be subjected to the axial tensile, torsional, and bending external loads in service. The axial tensile, torsional, and bending resistance of the bolted flange is vital for the system vibration, dynamic strength, and reliability. This paper investigates the nonlinear deformation behavior of bolted flanges under tensile, torsional, and bending loads, using finite element analysis (FEA). Even though the bolted flange materials may still deform elastically, the variation in contact area due to the external loading may still cause nonlinear deformation of the flanges. In this study, finite element simulation is used for investigating the respective nonlinear deformation behavior of a preloaded bolted flange under tensile, torsional, and bending loads, and to determine the corresponding stiffness values for each loading.

scholarly journals In Situ Synchrotron X-ray Diffraction Investigations of the Nonlinear Deformation Behavior of a Low Modulus β-Type Ti36Nb5Zr Alloy

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1619
Author(s):  
Qingkun Meng ◽  
Huan Li ◽  
Kai Wang ◽  
Shun Guo ◽  
Fuxiang Wei ◽  
...  
Keyword(s):  
Elastic Deformation ◽  
Deformation Behavior ◽  
Nonlinear Deformation ◽  
Deformation Mechanisms ◽  
X Ray Diffraction ◽  
Recoverable Strain ◽  
X Ray ◽  
Ti Alloys ◽  
Low Modulus

The low modulus β-type Ti alloys usually have peculiar deformation behaviors due to their low phase stability. However, the study of the underlying mechanisms is challenging since some physical mechanisms are fully reversible after the release of the load. In this paper, the deformation behavior of a low modulus β-type Ti36Nb5Zr alloy was investigated with the aid of in situ synchrotron X-ray diffraction (SXRD) during tensile loading. The evolution of lattice strains and relative integrated diffraction peak intensities of both the β and α” phases were analyzed to determine the characteristics of the potential deformation mechanisms. Upon loading, the α” diffraction spots appeared at specific azimuth angles of the two-dimensional SXRD patterns due to the <110> fiber texture of original β grains and the selection of favorable martensitic variants. The nonlinear deformation behavior originated from a reversible stress-induced martensitic transformation (SIMT). However, the SIMT contributed a little to the large recoverable strain of over 2.0%, which was dominated by the elastic deformation of the β phase. Various deformation mechanisms were activated successively at different applied strains, including elastic deformation, SIMT and plastic deformation. Our investigations provide in-depth understandings of the deformation mechanisms in β-type Ti alloys with low elastic modulus.

Nonlinear Deformation Behavior of Bolted Flanges Under Tensile, Torsional and Bending Loads

2010 ◽  
Author(s):  
Zhijun Wu ◽  
Sayed A. Nassar ◽  
Xianjie Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Deformation Behavior ◽  
Nonlinear Deformation ◽  
External Loading ◽  
Element Analysis ◽  
Linear Deformation ◽  
Element Simulation ◽  
Bending Loads ◽  
Bolted Flange

This paper investigates the nonlinear deformation behavior of bolted flanges under tensile, torsional and bending loads, using Finite Element Analysis (FEA). Even though the bolted flange may still deform elastically, the variation in contact area due to the external loading will cause nonlinear deformation. In this study, finite element simulation is used for investigating the respective non-linear deformation behavior of a preloaded bolted flange under tensile, torsional and bending loads, and to determine the corresponding stiffness values for each loading.

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