Engineering and Technology Journal

We are pleased to announce the official launch of the new website for Engineering and Technology Journal (ETJ) on the Digital Commons (Elsevier) platform. This transition represents an important step toward enhancing the journal’s visibility, improving the submission workflow, and providing a more streamlined experience for readers, authors, reviewers, and editorial board members.

The new platform is now fully operational, and authors are invited to submit their manuscripts directly through the updated system. All article submissions, revisions, and correspondence will be managed exclusively through this new website.

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يسرّنا أن نعلن عن الإطلاق الرسمي للموقع الإلكتروني الجديد لمجلة الهندسة والتكنولوجيا (ETJ) على منصة Digital Commons (Elsevier). ويُعد هذا الانتقال خطوة مهمة نحو تعزيز حضور المجلة وانتشارها، وتحسين آلية استلام ومعالجة البحوث، وتوفير تجربة أكثر سلاسة وتنظيمًا للقراء، والباحثين، والمقيمين، وأعضاء الهيئة التحريرية.

أصبحت المنصة الجديدة قيد التشغيل بشكل كامل، وندعو الباحثين الكرام إلى تقديم بحوثهم مباشرةً عبر النظام المحدَّث. وستُدار جميع عمليات تقديم المقالات، والمراجعات، والمراسلات حصريًا من خلال هذا الموقع الجديد.

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نحثّ مجتمع الباحثين والمساهمين على زيارة المنصة الجديدة، والاطلاع على خصائصها، والبدء باستخدامها في جميع عمليات التقديم المستقبلية.

نتطلع إلى مواصلة خدمة المجتمع العلمي بكفاءة أعلى وانتشار عالمي أوسع.

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A comparative study of viscoelastic characteristics in polymer composite with respect to the damping performance and structural behavior
https://doi.org/10.30684/etj.2025.160856.1965
Abstract
This study systematically investigates the viscoelastic characteristics and damping performance of polymer composites, examining the interplay between filler morphology, matrix-filler interactions, and structural behavior. The purpose is to understand and predict how different fillers influence key viscoelastic properties to enable tailored composite design. Methods and Key Findings: Dynamic mechanical analysis (DMA) and forced vibration tests were used to characterize temperature- and frequency-dependent viscoelastic properties, including storage modulus (E′), loss modulus (E′′), and damping factor (tanδ). Key results demonstrate distinct effects: Spherical calcium carbonate increased stiffness (E′) by 45% at 15 wt% loading but restricted damping (tan δ) due to agglomeration-induced stress concentrations. In contrast, core-shell rubber particles increased tan δ by 280% through interfacial slip, achieving a damping ratio (ζ) of 0.052 (2.8 times higher than neat epoxy). Nanoclay composites exhibited frequency-dependent damping anisotropy from processing alignment. Hybrid filler systems showed synergistic damping effects within the 10–50 Hz range. Optimal performance occurred at 5 wt% Al₂O₃, balancing moderate stiffness (E′ = 1.5 GPa) with peak damping (tan δ = 0.82). Microstructural analyses (SEM/AFM) correlated maximized interfacial friction and damping with an agglomerate area fraction