Design tool to predict the open-hole failure strength of composite laminates subjected to in-plane loads

Moure, M.M.; Herrero-Cuenca, J.; García-Castillo, Shirley K.; Barbero, Ever J.

doi:10.1016/j.compstruct.2020.111970

Cited by 13 publications

(8 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mar‐Lin model [ 44 ] is evolved from the classical fracture mechanics method, which is suitable for predicting the strength of laminate with opening less than the diameter of 25.4 mm under the tension loading. It calculates the failure strain at the far‐field of finite width plate with a hole given as:

ε_{N}^{\infty} = H_{c} \cdot L^{- n \cdot g (\frac{true}{E})} \cdot f (\frac{true}{E}) \cdot h (t) f_{t} (w)

where

H_{c}

is the fracture toughness parameter of laminate, which is related to material properties in RTD environment, 12,994 is used;

L

is the length of cutting or crack;

n

is the singular parameter of laminate, which is also related to material properties in RTD environment, 0.3149 is used;

f (\frac{true}{E})

is the layer ratio correction factor of

H_{c}

;

g (\frac{true}{E})

is the layer ratio correction factor of

n

;

h (t)

is the correction factor of thickness,

f_{t} (w)

is the correction factor of width.…”

Section: Analytical Strength Modelmentioning

confidence: 99%

“…[31] For the purpose of macroscopic homogenization, the point stress method combined with material test data has been widely used in laminate opening failure prediction in engineering analysis. [32] Another failure criteria is Mar-Lin fracture model, [44] which is suitable for residual strength analysis of laminates with hole size less than 50 cm (for compressive load) or less than 25 cm (for tensile load). For the purpose of further limiting the number of experiments conducted, a probabilistic neural network based approach was proposed to predict the tensile strength of laminates without and with an open-hole.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of tensile damage characteristics of single filled bolt hole in laminate

Zhang

Pan

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

The strength of filled bolt holes of composites is an important parameter in developing the bearing bypass envelope curves for bolted joint structures in engineering design. This paper presents the procedures of tensile failure strengths and damage for a laminate with a filled bolt hole. Tests of two different cases, open‐hole tension (OHT) and filled‐hole tension (FHT), were performed and repeated seven times, respectively. A new type of virtual testing based on the LaRC05 criteria coupling with XFEM crack technique was developed to predict and analyze the crack initiation and early propagation around the bolt hole in the laminates. Two analytical methods were also adopted to predict the residual strength for a laminate after drilling. The results show that the thinner sample would present a higher strength with the same material system. It is also shown that the virtual test can well capture the failure modes, revealing that the 0° fiber has a natural function of crack arrest, the 90° layers that are the fracture pioneers with matrix tensile failure trigger the fiber breakage of 0° layers, and the failure of 45° layers occurs at the last. Additionally, an interesting phenomenon is observed that the initial failure around the filled hole edge does not affect the structural stiffness. Finally, a good agreement is achieved among the experimental, analytical and numerical results. It suggests that the results could provide a valuable guidance for the design of multi‐bolted joint structure.

show abstract

ε_{N}^{\infty} = H_{c} \cdot L^{- n \cdot g (\frac{true}{E})} \cdot f (\frac{true}{E}) \cdot h (t) f_{t} (w)

where

H_{c}

is the fracture toughness parameter of laminate, which is related to material properties in RTD environment, 12,994 is used;

L

is the length of cutting or crack;

n

is the singular parameter of laminate, which is also related to material properties in RTD environment, 0.3149 is used;

f (\frac{true}{E})

is the layer ratio correction factor of

H_{c}

;

g (\frac{true}{E})

is the layer ratio correction factor of

n

;

h (t)

is the correction factor of thickness,

f_{t} (w)

is the correction factor of width.…”

Section: Analytical Strength Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of tensile damage characteristics of single filled bolt hole in laminate

Zhang

Pan

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…Reduction in strength is caused by stress concentration in the vicinity of hole boundary. [5][6][7] A schematic representation of the effect of stress concentration on the laminate with a hole is represented by the use of force flow lines, as shown in Figure 2. Force flow lines bypass the hole and generate stress concentration in the vicinity of hole boundary.…”

Section: Introductionmentioning

confidence: 99%

“…Even while CFRP components with hole provide great savings in weight fulfill functional requirements and help in the assembly, the presence of hole itself results in the reduction of strength. Reduction in strength is caused by stress concentration in the vicinity of hole boundary 5–7 . A schematic representation of the effect of stress concentration on the laminate with a hole is represented by the use of force flow lines, as shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

An analysis on tensile and flexural loading response for unidirectionalCFRPlaminate with cutout/hole: Geometrical design effect on the material strength

Gupta

Pal

Ray

2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

A comparative analysis has been done on CFRP laminate to understand the design aspect of cutouts under tensile and flexural loading. Detailed analysis of strength, modulus, and variance in failure mechanism has been done to assess the relationship between material strength and design under two different loading conditions. Longitudinal and cross ply stacking sequences are considered. Tensile loading is found to be more detrimental than flexural loading for composite laminate with hole. SEM and optical micrographs have been analyzed to perceive the failure mechanisms of laminates under two different loading conditions. Mode I dominated delamination and mode II dominated delamination are found to be prevalent in OHT (open hole tensile) and OHF (open hole flexural) failure, respectively.

show abstract

“…By the way, in most cases, multi-openholes have been inevitably machined in thin-walled structures for different purposes of engineering design, such as facilitating bolting or riveting, damage checks or water leaks in rainy days, and so forth. [44,45] However, the existence of holes causes the fiber discontinuity in CFRP layer, resulting in stress concentration, and even rapidly aggravate the damage, which eventually leads to a significant reduction in the bearing capacity. [46] In order to solve this key problem in lightweight design, it is particularly important to fit the induction concept and actual engineering design, and to arrange the hole size and location reasonably.…”

Section: Introductionmentioning

confidence: 99%

Crashworthiness analysis of perforated metal/composite thin‐walled structures under axial and oblique loading

Fan

et al. 2021

Polymer Composites

View full text Add to dashboard Cite

As a kind of lightweight structure with great economic benefits, metal/composite hybrid structure is raising rapidly among automobile safety components due to its excellent anti-collision performance. In this paper, a new design was developed by introducing an induced circular hole to improve the energy absorption performance of the AL/CFRP hybrid thin-walled tubes under different loading conditions. Quasi-static experiments and finite element simulation were carried out on the hybrid tubular sample with induced circular holes, and the crash resistance of the number and diameter of induced round holes under different loading angles (θ) of 0 ,10 , 20 , and 30 was analyzed through the verified finite element model. The results showed that the induction hole can effectively reduce the peak load and improve the energy absorption characteristics of the hybrid thin-walled tube under the axial (0) load. Under the inclined load, the energy absorption capacity of all samples decreased to different degrees with increasing loading angle, and the induced hole changed the deformation mode of the hybrid tube, especially under the 30 loading angle. The complex proportional assessment is then implemented on the optimal structures, and specific energy absorption, peak crush force, and crush force efficiency were selected as the objective functions to improve the overall impact resistance under different loading angles. Considering three design cases, the AL/CFRP hybrid thin-walled structure with three groups of induced holes are finally found as the best energy absorbing devices. The work in this paper can provide a guide for the design of advanced energy absorbing devices for arbitrary loading condition.

show abstract

Design tool to predict the open-hole failure strength of composite laminates subjected to in-plane loads

Cited by 13 publications

References 31 publications

Analysis of tensile damage characteristics of single filled bolt hole in laminate

Analysis of tensile damage characteristics of single filled bolt hole in laminate

An analysis on tensile and flexural loading response for unidirectionalCFRPlaminate with cutout/hole: Geometrical design effect on the material strength

Crashworthiness analysis of perforated metal/composite thin‐walled structures under axial and oblique loading

Contact Info

Product

Resources

About