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All Journal Jurnal Karya Pendidikan Matematika Civil Engineering Journal
Kuswardi, Yemi
Department Of Mathematics Education, Universitas Sebelas Maret, Surakarta 57126,
Civil Engineering, Building, Construction & Architecture Education Mathematics

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Investigation of Honeycomb Sandwich Panel Structure using Aluminum Alloy (AL6XN) Material under Blast Loading Dany Taufiq Alim Ansori; Aditya Rio Prabowo; Teguh Muttaqie; Nurul Muhayat; Fajar Budi Laksono; D. D. Dwi Pria Tjahjana; Ari Prasetyo; Yemi Kuswardi
Civil Engineering Journal Vol 8, No 5 (2022): May
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2022-08-05-014

Abstract

In this study, we focused on the large inelastic behavior of a sandwich panel made of two solid plates as a stiffener and a honeycomb core shell subjected to blast load. The loading scheme was carried out using an explosive charge bullet mounted at a standoff distance of 100 mm with three mass variations of trinitrotoluene: 1, 2, and 3 kg TNT. The numerical simulations performed using ABAQUS/CAE were validated with the experimental results of a previous study. The geometrical effects of the sandwich panel on intact and damaged models were also numerically investigated. The panel was designed using a square and hexagonal honeycomb core. The effect of honeycomb core height was also observed by modeling the core using three height variations: 31, 51, and 71 mm. The results showed that the hexagonal core was more resistant to blast loads than the square design. The core height parameter determines the energy absorption based on these results. The structural strength is also affected by the damage. The findings of this study can be used to improve structural designs that utilize sandwich panels to withstand blast loads. Doi: 10.28991/CEJ-2022-08-05-014 Full Text: PDF
Analisis Kesalahan dalam Menyelesaikan Soal Bangun Ruang Sisi Datar Berdasarkan Teori Nolting Ditinjau dari Gaya Kognitif Siswa Kelas IX MTS Muhammadiyah Surakarta Reza Mozan Ariazena; Ira Kurniawati; Yemi Kuswardi
Jurnal Karya Pendidikan Matematika Vol 12, No 1 (2025): Jurnal Karya Pendidikan Matematika Volume 12 Nomor 1 Tahun 2025
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/jkpm.12.1.2025.86-96

Abstract

This study aims to describe and analyse the types of errors made by student of IX MTs Muhammadiyah Surakarta in solving problems on the polyhedron material based on Nolting’s theory. This research uses indicator of the types of Nolting errors, namely Misread direction Errors, Careless Errors, Concept Errors, Application Errors, and Test-taking Errors. This study uses a qualitative approach with a descriptive method. The sampling technique used was purposive sampling, with four research subjects in grade IX B MTs Muhammadiyah Surakarta for the 2024/2025 academic year who had been classified based on their cognitive styles using with the Group Embedded Figures Test (GEFT) instrument. The data collection technique was a tes techniques and interview. The data collection techniques used were test and interview techniques. The validity was tested using the triangulation method, while the data analysis technique was carried out through the stages of data reduction, data presentation, and conclusion drawn. The analysis revealed that students with a field dependent cognitive style committed all types of errors outlined by Nolting, while those with a field independent style were more prone to Misread Direction Errors, Careless Errors, and Test-taking Errors. Among all errors types, Test-taking Errors were the most commonly observed.
Co-Authors Aditya Rio Prabowo Anggoro Canggih Pinilih Anggoro Canggih Pinilih Ari Prasetyo Budi Usodo Budi Usodo Budi Usodo Chrisnawati, Henny Ekana D. D. Dwi Pria Tjahjana Dany Taufiq Alim Ansori Fajar Budi Laksono Farida Nurhasanah Fitriana, Laila Handayani, Hesti Imam Sujadi Kurniawati, Ira Luthfi Almira Muhayat, Nurul Novita Nurussakbana Pratiwi, Bibit Lutfi Purnama, Agung Eka Reza Mozan Ariazena Rubono Setiawan Sutopo Sutopo Sutopo Sutopo Teguh Muttaqie Zulaikah, Siti