[1]Postdoctoral Research Station of Mechanical Engineering,Harbin Engineering University,150001,China;
[2]Northeast Forestry University,150040,China;
[2]Northeast Forestry University,150040,China;
[3]College of Mechanical and Electrical Engineering,Harbin Engineering University,150001,China;
[2]Northeast Forestry University,150040,China;
[1]Postdoctoral Research Station of Mechanical Engineering,Harbin Engineering University,150001,China;
TRIZ conflict matrix; coefficient of thermal expansion; pile welding; Fourier''''s Law.;