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Abstract Depending on study mechanical properties and acoustic idices for polystyren-bentonite composite samples by using ultrasonic waves technique at non-destructive test. The mechanical dynamic variables were studied by using technique of velocity of an ultrasonic wave pulse from which wave velosity, elastic modulus, dencity, shear viscosity, absorbtion coefficient, relaxation time, relaxation amplitude, compressibility and wave length at room temperature after and befor irradiation. The results showed that all properties increase lineary or exponentially with increasing of composite concentration while decreasing specific acoustic impedance, elastic modulus, velosity and wave length.

اﳋلاﺻة ﺍﻋﺘﻤﺪ ﻟﺪﺭﺍﺳﺔ ﺍﳋﻮﺍﺹ ﺍﳌﻴﻜﺎﻧﻴﻜﻴﺔ ﻭﺍﳌﻌﺎﻣﻼﺕ ﺍﻟﺼﻮﺗﻴﺔ ﻟﻠﻨﲈﺫﺝ ﺑﻮﻟﻴﺴﺘﺎﻳﺮﻳﻦ - ﺑﻨﺘﻮﻧﺎﻳﺖ ﺍﳌﱰﺍﻛﺒﺔ ﺑﺎﺳﺘﺨﺪﺍﻡ ﺗﻘﻨﻴﺔ ﺍﻟﻔﺤﺺ ﺑﺎﻟﺬﺑﺬﺑﺎﺕ ﻓﻮﻕ ﺍﻟﺼﻮﺗﻴﺔ ﻛﻔﺤﺺ ﻏﲑ ﺍﺗﻼﰲ. ﻭﺗﻢ ﺩﺭﺍﺳﺔ ﻣﺘﻐﲑﺍﺕ ﺍﳌﻴﻜﺎﻧﻴﻚ ﺍﻟﺪﻳﻨﺎﻣﻴﻜﻲ ﺑﺘﻘﻨﻴﺔ ﴎﻋﺔ ﻧﺒﻀﺔ ﺍﳌﻮﺟﺔ ﻓﻮﻕ ﺍﻟﺼﻮﺗﻴﺔ ﺣﻴﺚ ﺗﻢ ﺍﺳﺘﺨﺮﺍﺝ ﻗﻴﻢ ﻛﻞ ﻣﻦ ﴎﻋﺔ ﺍﳌﻮﺟﺔ ،ﻣﻌﺎﻣﻞ ﺍﳌﺮﻭﻧﺔ ،ﺍﻟﻜﺜﺎﻓﺔ، ﺍﻟﻠﺰﻭﺟﺔ ﺍﻟﻘﺼﻴﺔ، ﻣﻌﺎﻣﻞ ﺍﻻﻣﺘﺼﺎﺹ، ﺯﻣﻦ ﺍﻻﺳﱰﺧﺎﺀ، ﺳﻌﺔ ﺍﻻﺳﱰﺧﺎﺀ، ﺍﻻﻧﻀﻐﺎﻃﻴﺔ ﻭﺍﻟﻄﻮﻝ ﺍﳌﻮﺟﻲ ﻋﻨﺪ ﺩﺭﺟﺔ ﺣﺮﺍﺭﺓ ﺍﳌﺨﺘﱪ ﻗﺒﻞ ﺍﻟﺘﺸﻌﻴﻊ ﻭﺑﻌﺪﻩ. ﺑﻴﻨﺖ ﺍﻟﻨﺘﺎﺋﺞ ﺍﻥ ﲨﻴﻊ ﺍﳋﻮﺍﺹ ﺗﺰﺩﺍﺩ ﺯﻳﺎﺩﺓ ﺧﻄﻴﺔ ﺍﻭ ﺍﺳﻴﺔ ﻣﻊ ﺯﻳﺎﺩﺓ ﺗﺮﻛﻴﺰ ﺍﳌﱰﺍﻛﺐ ﺑﻴﻨﲈ ﺗﻨﺎﻗﺼﺖ ﻗﻴﻢ ﺍﳌﲈﻧﻌﺔ ﺍﻟﺼﻮﺗﻴﺔ ﺍﻟﻨﻮﻋﻴﺔ ﻭﻣﻌﺎﻣﻞ ﺍﳌﺮﻭﻧﺔ ﻭﺍﻟﴪﻋﺔ ﻭﺍﻟﻄﻮﻝ ﺍﳌﻮﺟﻲ.

polystyren-bentonite --- ultrasonic waves technique --- specific acoustic impedance. --- ﺑﻮﻟﻴﺴﺘﺎﻳﺮﻳﻦ - ﺑﻨﺘﻮﻧﺎﻳﺖ، ﺗﻘﻨﻴﺔ ﺍﻟﻔﺤﺺ ﺑﺎﻟﺬﺑﺬﺑﺎﺕ ﻓﻮﻕ ﺍﻟﺼﻮﺗﻴﺔ، ﺍﳌﲈﻧﻌﺔ ﺍﻟﺼﻮﺗﻴﺔ ﺍﻟﻨﻮﻋﻴﺔ.