تحليل و بهينه‌سازي ورق ساندويچي با هسته چوب بالسا تحت بارگذاري انفجاري

Analysis and Optimization of Balsa Wood Core Sandwich Plate under Explosive Load

انجام يك طراحي ايمن و بهينه كه با حداقل هزينه حداكثر كارايي فراهم شود، نيازمند شناخت دقيق اثرات انفجار و ضربه بر سازه و هم¬چنين رفتار سازه در برابر اثرات وارده مي‌باشد. در اين مقاله ورق ساندويچي با هسته چوب بالسا با جنس‌ها، ضخامت‌‌ها و زاويه‌هاي مختلف توسط روش كوپل اويلري-لاگرانژي تحت بارگذاري انفجاري ناشي از انفجار 2/2 كيلوگرم ماده منفجره تي ان تي (TNT) تحليل شده و تأثير متغيرهاي مذكور بر استحكام ورق مطالعه شده و سپس ورق از لحاظ جنس فيبر، ضخامت و زاويه لايه¬ها بهينه‌سازي شده است. در اين پژوهش،فرآيند بهينه‌سازي با استفاده از الگوريتم ژنتيك چندهدفه انجام شده و در پايان ورق ساندويچي كه در برابر انفجار مقاوم باشد، معرفي شده است .

To perform a safe and efficient design to provide maximum performance with minimum cost,We need a detailed understanding of the effects of blast and impact on structures, as well as reactions against the effects of theme.In this paper the sandwich plates with Balsa wood core is analyzed with different thicknesses and angles under explosion load of 2.2 kg TNT by coupling Lagrangian-Eulerian methodand the effect of previousmentioned parameters on the sheet strength is studied and then the plate optmized in terms of Fiber kinds, layerthicknesses and angles. The distance between TNT and sandwich plate is considered as150mm In thisanalysis, upper and lower laminates are made with glass fiber with epoxy resin and core is made of balsa wood. The volume fraction is considered as 0.4. The equivalent engineering properties of each lamina is computed by codepreparation. The symmetry layers are considered in sandwich plate. The plateis considered as elasto-plastic solid and its mesh is generated by Lagrangian approach. The meshes of the air and the explosive materials are produced by Eulerian method. The governing equations is discretized usingfinite element method) weak form(, then the explicit method is used to solve time dependent equations.optimization processis done using Multi-Objective Genetic Algorithmand at the end the sandwich plate that is resistant to blast, has been introduced.