ارزيابي تجربي و عددي خواص و رفتار مكانيكي ساختار مشبك كلوين، ساخته‌شده توسط روش SLM

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در اين مقاله، خواص و رفتار مكانيكي ساختار مشبك كلوين به­ صورت تجربي و عددي مورد بررسي قرار گرفته است. ساختار مورد نظر، از جنس فولاد زنگ نزن 316L مي­باشد و با استفاده از روش ذوب انتخابي به ­كمك ليزر (SLM) ساخته شده است. به ­منظور بررسي رفتار و خواص مكانيكي ساختار مشبك كلوين، آزمون فشار شبه استاتيك انجام شد. مدل­سازي اجزاي محدود با هدف پيش­بيني خواص و رفتار مكانيكي ساختار مشبك كلوين صورت پذيرفت. بر اساس تصاوير تهيه ­شده، ساختار مشبك كلوين بدون نقص و مطابق با هندسه از پيش ­تعيين ­شده ساخته شد. نتايج آزمون فشاري تجربي حاكي ­از خواص مكانيكي مطلوب، توانايي جذب انرژي بالا و تكرارپذيري عالي نتايج ساختارهاي مشبك ساخته ­شده مي­باشد. همچنين مدل­سازي اجزاي محدود از همخواني مناسب با نتايج تجربي برخوردار بود.

Currently, with the advancement and development of the additive manufacturing technology (AM), many studies are conducted to evaluate the behavior and mechanical properties of lattice structures. Due to their ability to control mechanical properties, these structures have been considered by researchers. In this paper, the properties and mechanical behavior of the kelvin lattice structure were investigated experimentally and numerically. The intended structure is 316L stainless steel and is fabricated using the selective laser melting (SLM) method. The build quality and mechanical properties of the kelvin lattice structure were evaluated. Build quality was evaluated using the digital microscope and scanning electron microscope (SEM). As well as to evaluate the behavior and mechanical properties of the kelvin lattice structure, quasi-static compression test was performed. Finite element modeling was carried out to predict the mechanical properties and behavior of the kelvin lattice structure. To do this, the unit cell method was used. Based on the provided images, the kelvin lattice structure was fabricated without defect and in accordance with the previously defined geometry. The experimental compressive test results show the favorable mechanical properties, the ability to absorb energy, and the excellent reproducibility of the fabricated lattice structures results. Finite element modeling had a good agreement with experimental results which can be used to predict the behavior and mechanical properties of the kelvin lattice structure with much less time and cost than the experimental method.