Abstract
Quasi-brittle materials such as composite laminates, concrete, and toughened ceramics are subject to size effects in which the nominal strength decreases with increasing specimen size. Analyzing the joining of such materials is very important. Mechanically bolted joints are a widely used and suitable method for joining composite laminates in aircraft materials. Two-parameter cohesive laws—linear, constant, and exponential—were implemented analytically to analyze tearing, bearing stress, and remotely applied stress. An extended 2-D finite element model was created to validate the remote applied stress. The model provides reasonably acceptable results that can be used as fast design data for the selection of such materials and optimization of composite bolted joints.
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Abbreviations
- \(\sigma_{{\text{b}}}\) :
-
Bearing stress
- \(\sigma\) :
-
Tensile stress
- \(\lambda\) :
-
Biaxiality ratio
- \(\delta\) :
-
Crack opening displacement
- \(\gamma\) :
-
Geometric parameter \(\gamma = \frac{R}{R + l}\)
- \(\alpha\) :
-
Load pressure angle
- w :
-
Width of the plate
- t :
-
Thickness of the plate
- r :
-
Crack tip radius
- R :
-
Radius of the hole
- P :
-
Contact pressure in loaded hole
- K :
-
Stress intensity factor
- F :
-
Applied force
- e :
-
Eccentricity
- d :
-
Half crack length with radius
- D :
-
Hole diameter
- a :
-
Crack length which is equal to hole radius
- \(\sigma_{{\text{u}}}\) :
-
Unnotch tensile strength
- \(\sigma_{i}\) :
-
Cohesive strength at point (i)
- \(\sigma_{{\text{C}}}\) :
-
Cohesive stress
- \(\rho_{{{\text{Cr}}}}\) :
-
The transformation function which relates the nominal strength by specimen size
- \(\theta_{{\text{l}}}\) :
-
Normalized fracture process zone length
- \(\delta_{i}\) :
-
Crack opening at pint (i) on crack face
- \(\delta_{{\text{C}}}\) :
-
Critical crack opening displacement
- \(\beta_{w}\) :
-
Aspect ratio which is equal to (R/w)
- \(\beta_{i} \left( {\theta_{l} , \beta_{w} , P} \right),\overline{\beta }\left( {\theta_{L} , \beta_{w} , P} \right)_{i}\) :
-
Connecting function for remote stress and loaded hole
- \(l_{{{\text{FPZ}}}}\) :
-
Length of fracture processing zone
- \(k_{T}\) :
-
Stress concentration factor
- \(f_{ij} \left( {\theta_{L} , \beta_{w} ,P} \right)\) :
-
Influence functions that are independent of the crack geometry and loading conditions
- \(a_{i}\) :
-
Crack length at point (i)
- \(S_{{\text{t}}}\) :
-
Tearing stress
- \(S_{{\text{s}}}\) :
-
Shear strength
- \(S_{{\text{r}}}\) :
-
Remote applied stress
- \(S_{{\text{n}}}\) :
-
Nominal strength of composite structure or net tension strength
- \(S_{{\text{b}}}\) :
-
Normalized bearing strength
- \(K_{\sigma }\) :
-
Cohesive stress intensity factor
- \(K_{{\text{s}}}\) :
-
Remote stress intensity factor
- \(K_{b}\) :
-
Loaded hole stress intensity factor
- \(K_{{{\text{sT}}}}\) :
-
Total stress intensity factor at crack tip
- \(K_{{{\text{Ic}}}}\) :
-
Fracture toughness
- \(G_{{{\text{IC}}}}\) :
-
Surface release energy or may called fracture toughness
- \(F_{4}\) :
-
Partially loaded finite width correction factor
- \(F_{3 }\) :
-
Partially loaded hole correction factor
- \(F_{2}\) :
-
Geometric correction factor for finite width
- \(F_{1}\) :
-
Geometric correction factor for circular hole
- \(F_{o}\) :
-
The correction factor of loaded holes
- \(\overline{{K_{i} }}\) :
-
The stress intensity of segment i
- \(\overline{C}_{i} ,\overline{b}_{i}\) :
-
Dimension for partially loaded cracks, i, j = 1, 2
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Abdellah, M.Y., Suker, D.K., Alharthi, H. et al. Stress Analysis Map** for Mechanically Fastened Composite Bolted Lap Joints Using Cohesive Zone Model. J Fail. Anal. and Preven. (2024). https://doi.org/10.1007/s11668-024-01952-4
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DOI: https://doi.org/10.1007/s11668-024-01952-4