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All Journal Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Rekayasa Mesin Journal of Engineering and Management in Industrial System International Journal of Mechanical Engineering Technologies and Applications (MECHTA)
Femiana Gapsari MF
Universitas Brawijaya
Automotive Engineering Computer Science & IT Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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STRESS CORROSION CRACKING SAMBUNGAN LAS CDW SS 316L DAN ASTM A36 DALAM VARIASI SUHU LINGKUNGAN KOROSIF FeCl2 Angga Saputra; Femiana Gapsari; Djarot B. Darmadi
Jurnal Rekayasa Mesin Vol. 13 No. 3 (2022)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v13i3.1244

Abstract

Stress Corrosion Cracking (SCC) is known as a trigger for material failure, especially in Dissimilar Metal Welding (DMW). Although DMW promises wide application in structural design, it is found that there is high SCC mitigation making it prone to failure. Capacitor Discharge Welding (CDW) is one of the best dissimilar metal welding methods. This article observes the weld joints of CDW ASTM A36 and SS 316L against the phenomenon of SCC in a corrosive environment temperature variation of FeCl2 0.5 Molar (30, 40, and 50 0C). The results of the Constant Load Test (CLT) show that the welding threshold strength has decreased significantly due to the increase in the galvanic corrosion current which increases at high temperatures. The stress threshold of specimen T1 with a temperature variation of 30 0C K1cc 360 MPa, the specimen T2 produces a threshold of 216 MPa and the specimen T3 with 144 MPa. It can be concluded that changes in the temperature of the corrosive environment accelerate the galvanic reaction which accelerates the occurrence of corrosiveness in the weld joint. SEM/EDS photo evaluation provides a perfect picture of the corrosive distribution of the fracture surface. At the highest temperature of 50 0C, the surface corrosive rate causes a lot of bubbles and porous pores in the weld fracture, this causes the connection threshold stress to weaken.
PHYSICAL, MECHANICAL, AND MORPHOLOGICAL CHARCTERISTICS OF KAPOK (CEIBA PENTANDRA) TREE BARK AND EPOXY COMPOSITE WITH COATING (AESO) TREATMENT Suparjon Suparjon; Femiana Gapsari; Budi Purnomo
Jurnal Rekayasa Mesin Vol. 14 No. 1 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i1.1218

Abstract

Environmentally friendly composites continue to be developed from kapok tree fiber (Ceiba pentandra) with an epoxy matrix. This study aims to characterize the tensile behavior of single fiber and its composite, the pull-out properties of kapok tree fiber, and morphology of the fiber. Kapok tree fibers were varied in the NaOH solution and the AESO polymer. Single fiber tensile test and pull out refer to the ASTM D3379-75 and ASTM E399 standards, respectively. The composite manufacturing method used in this research was the infusion vacuum resin method with reference to the ASTM D638 standard. The results of the tensile test (composite) showed that the kapok bark fiber with the characteristics of NaOH + Coating had a greater tensile strength (197,88 Mpa), than that without treatment and NaOH treatment. Of all the characteristics of the kapok bark fiber, the highest value of the tensile strength was the fiber treated with NaOH + Coating (KNC). The results of fiber morphology showed proved that the NaOH treatment increased the surface hardness by eliminating the bonds of surface crystallinity, topography, water absorption, unit cell structure and fiber orientation. These results indicate that kapok tree fiber treated with 7% NaOH + coating with AESO polymer has high potential as a structural material to replace wood or textile materials.
Co-Authors A.A. Ketut Agung Cahyawan W Angga Saputra Apollo Ode Rea Harjo Budi Purnomo Djarot B. Darmadi Dwi Hadi Sulistyorini Fikrul Akbar Alamsyah Franscisca Gayuh Utami Dewi Hariti Srijayasari Hariti Srijayasari M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Nugroho Bagus Pratikto Pratikto Putu Hadi Setyarini Putu Hadi Setyarini Sugiarto S Suparjon Suparjon Syarif Hidayatullah