Essential Work of Fracture and Size Effect in Copper/Glass-Reinforced Epoxy Laminate Composites Used as MEMS Devices

Hassan, Md. Salleh; Abdellah, Mohammed Y.; ElAbiadi, Tareq S.; Mohamed, Ahmed F.; Azam, Sufyan; Marzouk, W.W.

doi:10.12691/ajme-5-5-7

Cited by 5 publications

(5 citation statements)

References 25 publications

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“…In both groups, a frequency increase is observed as the specimen width also increases. This indicates that the W/D aspect ratio does not play a significant role and the modal behavior is governed by specimen stiffness and mass in spite of the fact that the size effect reduces nominal strength up to 15% [19]. Interestingly, the change in center-hole diameter at constant width in Groups 3 and 4 shows a very little difference in frequency for mode 1 in all the specimens.…”

Section: Frequency Spectra and Mode Shapesmentioning

confidence: 92%

“…Studies on the mechanical properties of this composite material are thus of important, in order to estimate the reliability of FR-4-based PCBs. We have recently studied the essential work of fracture on copper/FR-4 specimens of different sizes using a double edge notched test with and without open holes of different diameters [19]. The tested composites behaved as quasi-brittle hybrid materials due to the anisotropy of the FR-4 support that is in part compensated by the isotropic copper layer.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Simulation Study of the Vibration Properties of Thin Copper Films Bonded to FR4 Composite

Azam

Fragoso

2020

Applied Sciences

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Printed circuit boards constitute the basis of most electronic devices and are mainly fabricated of thin copper films bounded to fiber epoxy laminates, such as FR4. Vibrational stress can induce device failure, and hence, studies addressing their modal properties have important applications. In this paper, cantilever samples made of bare copper bounded to FR4 have been studied to analyze, for the first time, the vibration behavior of specimens with different aspect ratios, with and without central holes of different diameters. Natural frequencies and damping ratios were determined experimentally and analytically using a finite element method for four groups of samples with a very good correspondence between both methods. The fundamental resonance frequency of all the specimens was found to be less than 40 Hz and the influence of a central hole was not significant to affect the modal properties.

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Section: Frequency Spectra and Mode Shapesmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation Study of the Vibration Properties of Thin Copper Films Bonded to FR4 Composite

Azam

Fragoso

2020

Applied Sciences

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“…AE can monitor in real time the type of damage sources to be correlated with specific failure phenomena occurring in composites, such as fiber/matrix failure, friction, delamination, and so forth. [15][16][17][18][19] Acoustic Emission technique has demonstrated to be a vital characterization tool in order to obtain excellent results in the detection and identification of initiation sites, propagation, failure development and fracture mechanisms of polymeric matrix composite materials; likewise, it offers the possibility of relating the modes of fracture with the geometry of the reinforcement. [20,21] Andrew J. et.al, [22] analyzed epoxy/fiberglass laminate composites subjected to low velocity impact damage in order to investigate the effects of repair.…”

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confidence: 99%

Identification of micro‐failure processes of HDPE‐henequen fiber composite material by using acoustic emission monitoring: Effect of fiber surface modification

2023

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It is well known that fiber-matrix interface region is crucial to ensure an efficient stress transfer between matrix and reinforcement and that it controls the composite behavior when subjected to external loads. In this experimental study, micro-damage mechanisms of HDPE/surface modified henequen fiber reinforced composites are investigated in tensile quasi-static mode. Two essential parameters of the materials composition were taken as main indicators: fiber length and quality of the fiber matrix adhesion. Essential Work of Fracture theory (EWF) was applied on double edge notch tensile (DENT) specimen geometry. Acoustic Emission (AE) technique was coupled to composite samples to obtain the characteristics of stress waves signals to monitor in real time damage evolution and failure mechanisms detection. Results demonstrated the substantial effect of chemical bonds interaction in the interface area on the composite mechanical properties. The total fracture work (W f ) exhibited an increasing value in both components, W e and W p , in chemically treated fiber composites. Likewise, mechanical properties are reported to be higher by 37% in maximum load in such materials. Elastic waves detected by AE were identified and correlated to micromechanical events during composite damage sequence. Most of the signals corresponded to microcracks (signals of low amplitude, short duration), propagation of microcracks (signals of medium amplitude), fracture of fibers and matrix (signals of long duration and high amplitude). AE signals detected exhibiting higher energy were associated to an enhanced fiber/matrix interface. K E Y W O R D S acoustic emission, fiber/matrix bond, mechanical properties, polymer-matrix composites (PMCs) | INTRODUCTIONA composite material is a system of materials consisting of a mixture or combination of two or more micro or macro-constituents that differ in shape and chemical composition and are essentially insoluble with each other; such components are called reinforcement (or filler) and matrix. The matrix acts as a load transfer

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“…Optimizing G-E reinforcement involved limiting wear rate, choosing the right filler load and type, normal load, and abrasive size [16]. Numerous studies [17][18][19][20][21][22][23][24][25] have examined the mechanical characteristics of epoxy-based composite materials and have deduced how reinforcing affects both mechanical and fracture qualities. This study's main goals are to examine the wear behavior of epoxy/date seed powder bio-composites and the behavior of date palm seeds in the assessment of wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the hardness and wear behavior of date seed powder/epoxy composites as potential biomaterials

K. Hassan,

Assas

2023

J., eng., them. sci.

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The date palm, or Phoenix dactylifera, is a crop that is grown for food and is used by many people on a regular basis. The cultivation of date palms, their processing, and consumer demand all produce tons of waste. Date palm seeds can account for up to 10 % of the total weight of the fruits. A topic of interest for research is the application of date seed waste in the fields of engineering, nutrition, and cosmetics. This work aims to show that epoxy/palm seed date composites are suitable for use as biomaterials by examining their wear behavior. Give a brief introduction to a few ideas before going over the fundamental idea of wear resistance. Future wear resistance improvements in biomedical applications and other industries that might benefit from this addition will continue to be achieved through the use of date palm seed microparticles in epoxy. In this study, epoxy composites containing palm seed particles are made by the mixing procedure. The studied composites made from date palm seed powder particles has micron particle size of 150 which is mixed with epoxy as a matrix. The percentages of date palm seeds are varying from 5 % to 20 %. The 20 percent sample had the best results, losing 7.03 percent of their starting weight. The 10 percent group, which lost 9.4 percent, the 15 percent group, which lost 12.2 percent, and the 5 percent sample, which lost 19.95 percent, were the next in line. Each of the four samples had 1 kg to 5 kg of weight applied to them at five different rotation speeds. Upon analysis of all the samples under investigation, it was discovered that the date palm seeds enhanced and increased wear resistance, leading to better outcomes.

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Essential Work of Fracture and Size Effect in Copper/Glass-Reinforced Epoxy Laminate Composites Used as MEMS Devices

Cited by 5 publications

References 25 publications

Experimental and Numerical Simulation Study of the Vibration Properties of Thin Copper Films Bonded to FR4 Composite

Experimental and Numerical Simulation Study of the Vibration Properties of Thin Copper Films Bonded to FR4 Composite

Identification of micro‐failure processes of HDPE‐henequen fiber composite material by using acoustic emission monitoring: Effect of fiber surface modification

Evaluation of the hardness and wear behavior of date seed powder/epoxy composites as potential biomaterials

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