Analysis of stresses in drilled composite materials

Fernandes, Maria G.; Natal, Renato; Fonseca, E.M.M.

doi:10.1109/enbeng.2015.7088834

Cited by 3 publications

(5 citation statements)

References 5 publications

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“…The hole generation during the drilling process was simulated by the element deletion that occurs when the plastic strain of an element reached the limit. 8 LS-DYNA provides specific types of contact and several criteria for removing elements during a numerical simulation. A surface-to-surface contact analysis was established between drill bit and biomechanical block.…”

Section: Element Removal and Contact Interactionsmentioning

confidence: 99%

“…One of these problems is the cut effort achieved during the process and it directly related with the drilling parameters. [8][9][10] Usually, the drilling procedures are performed using the conventional drill bit through hand drills, which means that the feedrate is manually controlled by the surgeon. Thus, the cutting effort sensed by the surgeon is subjective and depends on the tool feed-rate, the bone quality and the type of the cut tool.…”

Section: Introductionmentioning

confidence: 99%

“…The purpose of this article is to summarise a recent progress of the obtained results on the experimental and numerical models for drilling processes in relation to the others investigations developed by the authors of this work. 8,19,20…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional dynamic finite element and experimental models for drilling processes

Fernandes

Fonseca

Natal

2015

Proceedings of the Institution of Mechanical Engineers, Part L:

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The main goal of this paper is to assess the mechanical damage in solid rigid foam materials with similar mechanical properties to the human bone induced by the cutting parameters. In the present study, a three-dimensional dynamic finite element model was developed to simulate the drilling process in solid rigid foam materials and it was validated with experimental results. Using an explicit dynamic numerical simulation, it is possible to obtain large structural deformation with high load intensity in short time frame. The developed model is used to study the effects of different high intensity loads distribution in the solid rigid foam materials. Laboratory tests were produced using biomechanical test blocks instrumented with strain gauges in different surface positions during the drilling process. The comparison between the numerical and the experimental results enables the evaluation and improvements of the cutting process. It was concluded when the feed-rate is higher, the stresses and strains in the solid rigid foam material are lower. The developed numerical model proved to be a great tool in this kind of analysis and available to use in forthcoming tests.

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Section: Element Removal and Contact Interactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three-dimensional dynamic finite element and experimental models for drilling processes

Fernandes

Fonseca

Natal

2015

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…The conclusion was verified by comparison with the surface profile after the experiment. Fernandes et al [10] built a three-dimensional dynamic model of the composite to simulate the drilling process. The results showed that the composites were less stressed and strained with the higher feed rate.…”

Section: Introductionmentioning

confidence: 99%

Research on Microscopic Properties of TiBw/TC4 Composites for Drilling Process

et al. 2019

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TiB-whisker-reinforced TiBw/TC4 composites are widely used in aviation, aerospace, automotive, and various other industries. However, the drilling force and temperature have a large effect on the drilling micromechanical properties of TiBw/TC4 composites. In order to explore the micro-mechanical properties and promote the optimization of drilling process, the representative volume elements of TiBW/TC4 composites were established in the Digimat-FE software tool to determine the micromechanical properties and failure mechanism of TiBW/TC4 composites. The results show: (1) maximum stress occurs at the whiskers, whereas the minimum stress appears within the basket matrix region of the reinforced phase. (2) When the force reached 300 N and the temperature reached 75 °C, the junction between the whiskers and the matrix firstly failed; when the force reached 525 N and the temperature reached 112 °C, the matrix began to fail; when the force reached 675 N and the temperature reached 138 °C, the whiskers failed. (3) The main reason for the failure of the junction between the matrix and the whiskers was that the shear stress exceeded the connection strength and the axial stress accelerated the failure process. Displacement and rotation of the whiskers were shown to occur at the moment of junction failure, owing to differences in the stress experienced on different sides of the material.

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“…Based on temperature measurements, several studies have been carried out to assess various parameters that influence surgical drilling into bone. 1,12,13,[32][33][34][35][36][37][38][39] However, the complexity of the process and the extensive number of variables involved complicates the statement of concluding remarks. Experimental models coupled to other methodologies, such as computational models, has been a common practice in this type of analysis.…”

Section: Introductionmentioning

confidence: 99%

THERMAL ANALYSIS IN DRILLING OF EX VIVO BOVINE BONES

Fernandes

Fonseca

Jorge

et al. 2017

J. Mech. Med. Biol.

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Bone drilling is a common procedure in Medicine, mainly in traumatology and orthopedic procedure for fractures fixation and in reconstructive surgery. The success of this surgical procedure is dependent on many factors, namely, on heat generation control during the bone drilling. The main concern in bone drilling is the mechanical and thermal damage of the bone induced by inappropriate parameters such as drill speed and feed-rate during the drilling. This study focuses on the temperature generated during drilling of cortical bone tissue (bovine origin) and solid rigid polyurethane foams with similar mechanical properties to the human bone tissue. Different parameters such as drill speed, feed-rate and hole depth were tested. All results showed that improvement of the drilling parameters and the drill temperatures can be estimated. It was concluded that when the drill speed and feed-rate were higher, the bone temperature increase was lower. The obtained results of temperature in the drilling process of polyurethane foam blocks or bovine bone were compared with a good agreement in between both.

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Analysis of stresses in drilled composite materials

Cited by 3 publications

References 5 publications

Three-dimensional dynamic finite element and experimental models for drilling processes

Three-dimensional dynamic finite element and experimental models for drilling processes

Research on Microscopic Properties of TiBw/TC4 Composites for Drilling Process

THERMAL ANALYSIS IN DRILLING OF EX VIVO BOVINE BONES

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