Vol. 16 No. 3 (2001)

This paper presents an experimental investigation of the single and double adhesively lap-bonding joint. The adhesive material used is Metalloam® grade III. The study was performed to investigate the influence of curing time on the shear strength of the bonding. The results show that the shear strength of the bonding joint increases with the curing time. The maximum shear strength was achieved after the curing time attaint 96 hours.

The stiffness of a cracked shaft changes due to the position of the crack. The problem is how to make a general equation of motion that can be used for all crack positions, so frequency response resulted represents the real frequency response of the cracked shaft. The cracked shaft modelling uses the moment inertia of cracked shaft at various crack positions is the first step. The second step is determining frequency response of significant crack position. The third step is determining the equivalent moment inertia of a cracked shaft that represents the condition of the crack. Next, by using…

Makalah ini membahas studi numerik tentang pengaruh besarnya distribusi partikel karet dalam polimer paduan terhadap ketangguhan retak. Analisa metode elemen hingga dilakukan pada daerah deformasi sekitar ujung retak pada pembebanan mode I untuk kondisi small scale yielding. Sekitar ujung retak dimodelkan sebagai material campuran antara matriks dengan partikel karet. Sebaliknya, daerah di luar sekitar ujung retak dimodelkan sebagai material homogen yang persamaan konstitutifnya telah diperoleh dengan analisa model sel satuan dari matriks dan partikel karet. Ikatan sempurna dan ikatan…

Pengaruh ketebalan benda uji terhadap keretakan pada beban statik telah banyak dilakukan. Kajian biasanya dilakukan dengan menganggap plastisitas ujung retak, yaitu kondisi tegangan dekat ujung retak, berada pada kondisi regangan dan tegangan bidang. Tulisan ini melaporkan hasil kajian numerik dan eksperimental pengaruh kondisi tegangan pada rongga yang menyatu akibat pulsa intensitas tegangan. Durasi pulsa yang digunakan adalah 20, 40, dan 80 μs. Pengamatan terhadap permukaan yang patah memperlihatkan adanya beberapa rongga di daerah inklusi dimuka ujung retak. Rongga utama tersebut…

Typically, mechanical vibration signature analysis is one of the essential steps in predictive maintenance activity for rotating machines. This paper discusses a study on the use of motor current signature analysis as a complement to the vibration signature analysis in identifying broken rotor bar in 3-phase induction motors. From literature study[5, 6, 7, 8, 9, 10, 11], it was summarized that the presence of rotor bar faults can be detected through the increase in (1x rpm ± Fs x p) side-bands amplitude of mechanical vibration. In addition, this type of fault is also signified by the increase…