Sunday, 29 April 2012

pengukuran yielding

Pengukuran batas luluh atau Yielding

Titik Luluh (Yield Point) dan Kekuatan Luluh (Yield Strength) adalah batas dimana material akan terus mengalami deformasi tanpa adanya penambahan beban. Tegangan (stress) yang mengakibatkan bahan menunjukkan mekanisme luluh ini disebut tegangan luluh (yield stress).
Gejala luluh umumnya hanya ditunjukkan oleh logam-logam ulet dengan struktur kristal BCC dan FCC yang membentuk interstitial solid solution dari atom-atom karbon, boron, hidrogen dan oksigen. Interaksi antar dislokasi dan atom-atom tersebut menyebabkan baja ulet seperti mild steel menunjukan titik luluh bawah (lower yield point) dan titik luluh atas (upper yield point).
Untuk baja berkekuatan tinggi dan besi tuang yang getas pada umumnya tidak memperlihatkan batas luluh yang jelas. Sehingga digunakan metode offset untuk menentukan kekuatan luluh material. Dengan metode ini kekuatan luluh ditentukan sebagai tegangan dimana bahan memperlihatkan batas penyimpangan/deviasi tertentu dari keadaan proporsionalitas tegangan dan regangan.

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