PERANCANGAN, PEMBUATAN DAN PENGUJIAN SENSOR GAYA BERKAPASITAS 100 KGF

• Main Author: Firmansjah Purnama A, EkaTaufiq
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/38196
• Institution: Institut Teknologi Bandung

Load cell is an element that construct weight/load measurement system. Force as a mechanical quantity can be measured electronically through this cell. Unfortunately, the price of this product is quite expensive though the way of its works and the production of this cell are not too complicated. A couple time ago Lab Dinamika PAU-ITB has designed, built and tested a 4 kgf capacity load cell that used aluminum alloy as the forming material. Since the applied loads were exceeding its capacity, the load cell was broken. Recently, Lab Dinamika need a load cell that can hold up to 100 kgf load for internal research need. Thus, the new 100 kgf capacity load cell with exceeding load protector need to be designed. Basically the principal of how the 100 kgf capacity load cell works is similar to the 4 kgf ones. Through its construction, axial force is directed in certain way on strain element to produce flexural strain. There are two important things that attention need to be taken. First, there must be no stress that exceeding the yield stress of the material of load cell. Thus, the new load cell dimension is larger than the old one. Its material is also replaced by a kind of alloy steel . Second, the strain where the strain gage is attached is need to be large enough so that even the small force can be detected. This research use MSC Nastran software to get the value of stress and strain on elements of load cell when load is applied. Load cell is tested by hanging the load so that load cell is under tensile axial condition. This test is carried out to get the characteristic of the load cell. As the result, load cell is capable to be used up to 100 kgf with 1.18 % maximum nonlinearity on half bridge test and 0,28 % hysteresis on quarter bridge test.