لحیم کاری قطره ای لیزری برای اتصال الکتریکی مواد کامپوزیتی

Laser droplet brazing for electrical contacting of composite

materials with integrated active elements

لحیم کاری قطره ای لیزری برای اتصال الکتریکی مواد کامپوزیتی ادغام شده با عناصر فعال

ABSTRACT

To be used as actuators or sensors, piezoceramic components have to be electronically contacted. A temperature stable connection can be achieved with brazing techniques. Since piezoceramics are susceptible to damage by high temperatures and temperature gradients, it is important to control the energy input in the brazing process. Therefore, we use a laser  droplet brazing method which allows for precise contacting of piezoceramics and avoids thermal damage. The influence  of the laser parameters on the brazing process and the contacting accuracy is presented in this paper.

 

روش های حرارتی برای بازیافت ضایعات کامپوزیتی

Thermal methods for recycling waste composites

روش های حرارتی برای بازیافت ضایعات کامپوزیتی

ABSTRACT

This chapter describes a thermal process based on a fluidised  bed for the recycling of glass and carbon fi bre from thermoset  composites. The process is particularly suitable for producing high  quality fi bre from contaminated or mixed materials. The chapter will  describe the fl uidised bed process, and detail the quality of the fi  bres  that are recovered. Applications for the reuse of the fi bre that have  been investigated will then be explained and the prospects for  commercial scale operation considered. Current and future research  directions will be outlined; other relevant research activities will also be mentioned.

 

کامپوزیت های زمینه پلیمری (PMC)

polymer matrix composite (PMC)

کامپوزیت های زمینه پلیمری (PMC) 

ABSTRACT

A high-performance polymer matrix composite (PMC) consists of a thermoset or thermoplastic resin matrix reinforced by fibers that are much stronger and stiffer than the matrix.1 Structural fibers that may be used as the reinforcement phase include carbon, aramid, glass, and many others. PMCs are attractive because they are lighter, stronger, and stiffer than conventional materials, with the additional advantage that their properties and form can be tailored to meet the needs of a specific application. Depending on the characteristics of the resin matrix and fiber reinforcements, PMCs may also be tailored to exhibit such properties as high thermal or electrical conductivity, stealth characteristics, and sensor capabilities.

 

کامپوزیت‎های زمینه سرامیکی بافته شده

Multiscale model of woven ceramic matrix composites

considering manufacturing induced damage

کامپوزیت‎های زمینه سرامیکی بافته شده با توجه به آسیب‎های ایجاد شده‎ی تولید

ABSTRACT

Multiscale models play an important role in capturing the nonlinear response of woven carbon fiber reinforced ceramic matrix composites. In plain weave carbon fiber/silicon carbide (C/SiC) composites, for example, when microcracks form in the as-produced parts due to the mismatch in thermal properties between constituents, a multiscale thermoelastic framework can be used to capture the initial damage state of these composites. In this paper, a micromechanics-based multiscale model coupled with a thermoelastic progressive damage model is developed to simulate the elastic and damage behavior of a plain weave C/SiC composite system under thermal and mechanical loading conditions. The multiscale model is able to accurately predict composite behavior and serves as a valuable tool in investigating the physics of damage initiation and progression, in addition to the evolution of effective composite elastic moduli caused by temperature change and damage. The matrix damage initiation and progression is investigated at various length scales and the effects are demonstrated on the global composite behavior.

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