J043041 Quantitative evaluation of machining damage around drilled holes in CFRP using micro-Raman spectroscopy

Miyake, Tetsuo; Futamura, Michinari; Tanaka, Takanori

doi:10.1299/jsmemecj.2012._j043041-1

Cited by 2 publications

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“…The gain could be important, especially thanks to new assembly technologies as bonding which is meant to replace the current techniques like riveting or bolting [1,2]. These methods are expensive, and are not well-adapted to composite materials since complex machining has to be set up (drilling leading to delamination or fiber breakage) [3][4][5]. Moreover, the use of the bonding technique would enable a significant weight lightening of the aeronautic structures, which means an aircraft consumption reduction.…”

Section: Introductionmentioning

confidence: 99%

A study of composite material damage induced by laser shock waves

Ecault

Boustie²,

Touchard³

et al. 2013

Composites Part A: Applied Science and Manufacturing

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A laser shock wave technique has been used to study the damage tolerance of T800/M21 CFRP (Carbon Fiber Reinforced Polymer) composite material with different lay-ups. Different levels of damage have been created according to various laser irradiation conditions. Several characterization methods such as Optical Microscopy, X-ray Radiography, or Interferometric Confocal Microscopy have been used to quantify these defects. The nature of the defects induced by the shock wave propagation has been studied. The sensitivity of the composite material damage to the shock conditions has been shown and quantified. Moreover, the experimental results gathered with each technique have been compared to each other and it leads to a better understanding of the CFRP behavior under high dynamic loading. These original results have enabled the definition of a specific damage criterion for CFRP under dynamic loading

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Section: Introductionmentioning

confidence: 99%

A study of composite material damage induced by laser shock waves

Ecault

Boustie²,

Touchard³

et al. 2013

Composites Part A: Applied Science and Manufacturing

View full text Add to dashboard Cite

show abstract

“…Microscopic damage by machining is supposed to be induced typically at the interface between fibers and matrix due to their far different nature in mechanical properties and results in changes in stresses at the interface, which depends on bonding state at the interface. So, drill-induced damage can be evaluated quantitatively by noticing stress at the interface between fiber and matrix (Miyake et al, 2012). It is supposed that residual stress in fibers will firstly occur resulting from plastic deformation of matrix resin.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of machining damage around drilled holes in a CFRP by fiber residual stresses measured using micro-Raman spectroscopy

Miyake

Mukae

Futamura

2016

Mechanical Engineering Journal

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Drilling used to assemble carbon fiber reinforced plastic (CFRP) parts is employed widely in industries. With drilling of CFRPs microscopic damage like residual stress or interfacial debonding between fiber and matrix is accompanied prior to macroscopic damage like delamination or chipping. Although not only macroscopic damage but also microscopic damage is closely related with overall performance of composites, there is no effective method to evaluate microscopic damage. In the present study, quantitative evaluation of drilling-induced damage was attempted by measuring details of residual stresses in fibers for a unidirectional CFRP. Stress distributions along fiber located at the drilled-hole periphery were evaluated in µm spatial resolution by means of micro-Raman spectroscopy. At first, to clarify the dependence of drilling effect on fiber orientation and fiber location, residual stresses in fibers orientated at angles of 0°, 90° and 180° to cutting-edge were measured both on drill-entry and drill-exit side surfaces. As the result residual stresses in fibers caused by drilling were all compressive and showed considerable dependence on fiber orientation to cutting-edge of the drill. Residual stress in fibers at 90° arose firstly even in low feed speed. Difference was also observed between stress distributions of fibers on drill-entry side and those on drill-exit side. Next in order to decide the highest speed drilling without damage, interfacial stress distributions were monitored with increasing feed speed. Experiments of the same feed rate with different rotational speed were also conducted to examine the effect of rotational speed. Damage at the interface, i.e., interfacial debonding occurred between 30 mm/min to 150 mm/min feed. And higher rotational speed resulted in smaller residual stress even in the same feed rate a rotation. Such results show that evaluation using micro-Raman spectroscopy is well applicable to prove details of drilling-induced damage quantitatively.

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J043041 Quantitative evaluation of machining damage around drilled holes in CFRP using micro-Raman spectroscopy

Cited by 2 publications

References 0 publications

A study of composite material damage induced by laser shock waves

A study of composite material damage induced by laser shock waves

Evaluation of machining damage around drilled holes in a CFRP by fiber residual stresses measured using micro-Raman spectroscopy

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