The 1940s was a period of industrialisation and construction and, after 1945, Lavrentev founded new areas of research in mechanics and applied physics which were aimed at laying the theoretical foundation necessary for the large construction projects of building dams, canals and bridges on the Volga, Dnieper and Don rivers.
Ang 1940s ay isang panahon ng industrialisation at konstruksiyon at, matapos ang 1945, Lavrentev itinatag bagong lugar ng pananaliksik sa mechanics at inilapat pisika na kung saan ay naglalayong sa pagtula ang panteorya pundasyon kinakailangan para sa mga malalaking contruction proyekto ng building dams, canals at Bridges sa Volga, Dnieper at Don ilog.