Second order shear lag theory

2012 ◽  
Vol 72 (12) ◽  
pp. 1313-1317 ◽  
Author(s):  
Staffan Toll
Keyword(s):  
Second Order ◽  
Shear Lag ◽  
Shear Lag Theory

scholarly journals Strength of B/Al Estimated by Computer Simulation Based on Shear-lag Theory

1989 ◽  
Vol 75 (9) ◽  
pp. 1738-1744
Author(s):  
Hideharu FUKUNAGA ◽  
Yoshihiro TAKAHASHI
Keyword(s):  
Computer Simulation ◽  
Shear Lag ◽  
Simulation Based ◽  
Shear Lag Theory

Analysis of Stresses for Cross-Ply Laminates with a Matrix Crack under Bending

2011 ◽  
Vol 284-286 ◽  
pp. 492-495
Author(s):  
Qing Dun Zeng ◽  
Mao Hua Ouyang
Keyword(s):  
Failure Mechanism ◽  
Transverse Crack ◽  
Approximate Solutions ◽  
Matrix Crack ◽  
Stress Distributions ◽  
Shear Lag ◽  
New Approach ◽  
Shear Lag Model ◽  
Lag Model ◽  
Shear Lag Theory

On the basis of the shear-lag theory, an analysis was presented for stress redistributions of cross-ply laminates with a transverse matrix crack in the 90º ply under bending by establishing a layered shear-lag model. The present results show that approximate solutions of displacement and stress distributions for cross-ply laminates with a transverse crack under bending can be obtained by using a shear-lag method. The present paper therefore affords a new approach for studying the stress redistributions and failure mechanism for cross-ply laminates with flaw under bending.

scholarly journals Strain Transfer Characteristics of Resistance Strain-Type Transducer Using Elastic-Mechanical Shear Lag Theory

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2420 ◽  
Author(s):  
Yongqian Li ◽  
Zhigang Wang ◽  
Chi Xiao ◽  
Yinming Zhao ◽  
Yaxin Zhu ◽  
...  
Keyword(s):  
Strain Gauge ◽  
Structural Parameters ◽  
Resistance Strain ◽  
Shear Lag ◽  
Strain Transfer ◽  
Resistance Strain Gauge ◽  
Transfer Characteristics ◽  
Strain Type ◽  
Type Transducer ◽  
Shear Lag Theory

The strain transfer characteristics of resistance strain gauge are theoretically investigated. A resistance strain-type transducer is modeled to be a four-layer and two-glue (FLTG) structure model, which comprises successively the surface of an elastomer sensitive element, a ground adhesive glue, a film substrate layer, an upper adhesive glue, a sensitive grids layer, and a polymer cover. The FLTG model is studied in elastic–mechanical shear lag theory, and the strain transfer progress in a resistance strain-type transducer is described. The strain transitional zone (STZ) is defined and the strain transfer ratio (STR) of the FLTG structure is formulated. The dependences of the STR and STZ on both the dimensional sizes of the adhesive glue and structural parameters are calculated. The results indicate that the width, thickness and shear modulus of the ground adhesive glue have a greater influence on the STZ ratio. To ensure that the resistance strain gauge has excellent strain transfer performance and low hysteresis, it is recommended that the paste thickness should be strictly controlled, and the STZ ratio should be less than 10%. Moreover, the STR strongly depends on the length and width of the sensitive grids.

Calculation Model for Crack Width of Smart Film Based on Shear-Lag Theory

2011 ◽  
Vol 255-260 ◽  
pp. 365-368
Author(s):  
Yong Xu ◽  
Zhi Xiang Zhou ◽  
Ben Niu Zhang
Keyword(s):  
Health Monitoring ◽  
Crack Width ◽  
Calculation Model ◽  
Concrete Bridges ◽  
Concrete Bridge ◽  
Shear Lag ◽  
Model Study ◽  
Theory Calculation ◽  
The Relationship ◽  
Shear Lag Theory

Detection of crack width is crucial in structural health monitoring of concrete bridge. In this paper, the smart film has been employed to monitor the crack initiation and development in concrete bridges. Under plane stress and two dimension conditions, through structure mechanics behavior analysis, the calculation model for crack width of smart film was constructed based on the shear-lag theory. Calculation model study demonstrated the relationship between crack width and diameter of the smart film, and the crack width could be calculated.

Numerical analysis and investigation of short- and long-term behavior of unidirectional composites

2017 ◽  
Vol 52 (5) ◽  
pp. 659-678
Author(s):  
Elias Dib ◽  
Jean François Caron ◽  
Wassim Raphael ◽  
Ioannis Stefanou ◽  
Fouad Kaddah
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Fiber Strength ◽  
Fiber Type ◽  
Glass Fibers ◽  
Shear Lag ◽  
Unidirectional Composites ◽  
Long Term Behavior ◽  
Shear Lag Theory

This study gives a detailed analysis on estimating the ultimate tensile strength of unidirectional fiber reinforced composites and its creep behavior under sustained tension load. We develop two different micromechanical models that allow us to estimate the longitudinal tensile strength and the evolution with time of fiber and matrix stresses around arbitrary array of fiber breaks. The first model is based on the shear-lag theory while the second one is developed using the software Abaqus. The comparison of the above models allowed to validate the fundamental assumptions of the shear-lag theory (first model) as well as several numerical issues related to time integration and spatial discretization. The Monte–Carlo method was used in order to account for the stochastic fiber strength and its impact on the ultimate tensile strength (short-term) and creep (long-term behavior) of unidirectional composites. Finally, a parametric investigation on the fiber type and the load level on the long-term behavior of unidirectional composites was performed showing an accelerating creep effect for fibers of inferior quality such as glass fibers compared to carbon fibers.

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