Long-term Open-hole Compression Strength of CFRP Laminates based on Strain Invariant Failure Theory

Cai, Hongneng; Miyano, Yasushi; Nakada, Masayuki

doi:10.1177/0892705708091607

Cited by 11 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, it is necessary to check and validate the accuracy of the proposed models as represented by equations ( 2) to ( 4). The accuracy of these models is determined by equation (5).…”

Section: Mathematical Modelling Of Temperaturementioning

confidence: 99%

“…[1][2][3][4] Polyetherimide composite has been widely utilized due to their costeffectiveness and unique properties. [5][6][7] The excellent mechanical properties of polyetherimide composites ensure easy machining, high dimensional rigidity, and high strength. [8][9][10] High temperatures during composite drilling influence micro and macro geometrical damages such as delamination, hole quality, microcracks, fiber pullout, and surface morphology damage.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In-situ temperature monitoring during rotary ultrasonic-assisted drilling of fiber-reinforced composites

Shard

Agarwal

Garg

et al. 2022

Journal of Thermoplastic Composite Materials

View full text Add to dashboard Cite

Drilling polyetherimide composite is difficult due to the anisotropic and inhomogeneous structure of fiber and matrix. Drilling of fiber-reinforced composites is a thermo-mechanical friction procedure required in various aerospace and automotive applications. The major reason for component rejection during manufacturing processes is due to thermal damage and temperature elevation defects such as delamination and fiber pullout caused during drilling. This work aims to propose a rotary ultrasonic-assisted drilling technique for composite materials to reduce thermal damage using diamond-impregnated tools. The influence of drilling parameters such as rotational speed, feed rate, abrasive grit size, and ultrasonic power was monitored on temperature elevations. The temperature was monitored using thermocouples located at different distances of 1.0, 2.0, and 3.0 mm from the main drilled hole. The response surface methodology was used for the design of experiments during the drilling of composite material and optimization of process parameters was carried out using analysis of variance. Rotational speed and abrasive grit size were observed to have the highest contribution of 42% and 37% for temperature elevations respectively. It was witnessed that temperature increases with an increase in rotational speed, feedrate, and abrasive grit size. Increasing the ultrasonic power during drilling temperature can be minimized. The temperature elevations at the tool-composite interface can be reduced by leveraging the application of rotary ultrasonic-assisted drilling.

show abstract

“…Therefore, it is necessary to check and validate the accuracy of the proposed models as represented by equations ( 2) to ( 4). The accuracy of these models is determined by equation (5).…”

Section: Mathematical Modelling Of Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In-situ temperature monitoring during rotary ultrasonic-assisted drilling of fiber-reinforced composites

Shard

Agarwal

Garg

et al. 2022

Journal of Thermoplastic Composite Materials

View full text Add to dashboard Cite

show abstract

“…When the fiber or matrix failure happens, the components of macro stiffness matrix degrade as shown in Table 1. The master curve of SIFT/ATM critical parameters, fiber tensile failure strain ε f,t,cr eqv , fiber compressive failure strain ε f,c,cr eqv , matrix dilatational failure J cr 1,m , matrix distortional failure ε m,cr eqv are determined through method described by Cai [8]. With the master curve of the SIFT/ATM critical parameters, failure criteria for fiber and matrix, and progressive damage analysis, the long-term strength of CFRP at arbitrary time to failure can be obtained.…”

Section: Strain Invariant Failure Criterion and Progressive Damage An...mentioning

confidence: 99%

“…The micromechanics-based failure criteria provide a possibility for long-term CSR and fatigue strength prediction of composite laminates by combining the ATM method. Cai [8,9] developed two prediction methods for long-term strength of CFRP combined ATM, with SIFT and MMF respectively. Long-term open-hole compression strength of quasi-isotropic CFRP laminates was predicted based on SIFT/ATM and MMF/ATM.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Long-Term Compression Strength for Quasi-Isotropic CFRP Laminates

Kang

Guan

Liu

et al. 2014

AMR

View full text Add to dashboard Cite

Long-term strength prediction method is developed based on three theories: accelerated testing methodology (ATM), strain invariant failure theory (SIFT) and progressive damage analysis (PDA). It can predict the strength and damage at a given failure time. Net resin 5228A was experimented by dynamic mechanical analysis and static tensile loading under various temperatures to determine the time-temperature shift factors and master curve of Young’s modulus. Unidirectional laminates of CCF300/5228A were tested under different temperatures to calculate the SIFT/ATM critical parameters. Long-term strength of quasi-isotropic composite laminates (QIL) was predicted. Good agreement between numerical results and experiments is observed, which demonstrates the applicability of this method.

show abstract

“…Tay et al [14] combined the element-failure method (EFM) with the SIFT to study the damage progression of composites. In the study of long-term, open-hole compression strength of laminates from Cai et al [15], micro-level failures were also addressed with the SIFT. However, the critical values in the SIFT need to be determined by tests of the laminates with specially-designed stacking sequences.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Analysis of CFRP Laminates with MMF3 Criterion under Different Off-Axis Loading Conditions

et al. 2018

View full text Add to dashboard Cite

A multiscale analysis strategy with physical modified-micromechanics of failure (MMF3) criterion was proposed to analyze the failure behaviors of carbon fiber reinforced plastic (CFRP) laminates. The quantitative relationship between the macro- and micro- stresses was determined considering two typical fiber distributions. Thermal residual stress was taken into account in the stress transformation. The failures were defined and the properties of damaged elements were degraded at the constituent level. The back-calculation method based on the iteration algorithm was proposed to determine the micro strength with macro mechanical tests. A series of off-axis loading tests were conducted to verify the established multiscale models. The predicted strength was also compared with the results using micromechanics of failure (MMF) criterion to present accuracy improvements. Thermal residual stress was found to affect the strength by contributing to the matrix damage status. Meanwhile, sensitivity analysis was provided for the matrix-dominant micro strength to investigate its physical meaning. Results suggest that the micro tensile and compressive strength of the matrix influenced the off-axis tensile and compressive strengths respectively, with relative large off-axis angles, while the micro shear strength of the matrix dominated when the off-axis angles were relative small.

show abstract

Long-term Open-hole Compression Strength of CFRP Laminates based on Strain Invariant Failure Theory

Cited by 11 publications

References 9 publications

In-situ temperature monitoring during rotary ultrasonic-assisted drilling of fiber-reinforced composites

In-situ temperature monitoring during rotary ultrasonic-assisted drilling of fiber-reinforced composites

Prediction of Long-Term Compression Strength for Quasi-Isotropic CFRP Laminates

Multiscale Analysis of CFRP Laminates with MMF3 Criterion under Different Off-Axis Loading Conditions

Contact Info

Product

Resources

About