Studi karakteristik penjalaran gelombang tegangan (stress wave) berupa emisi akustik (acoustic emission, AE) untuk penentuan metode prediksi lokasi sumber emisi pada material kaku (solid) baja tahan karat (stainless steel SS 304) = Research on charateristics of stress wave propagation as acoustic emission to determine a method for predicting the emission source location on solid material stainless steel SS304