Arturs Kalnins, 89, of Bethlehem, died August 13, 2020, at his residence. Born in Riga, Latvia, he was a son of the late Heinrichs and Emma (Purins) Kalnins. He was was the husband of Dzintra (Skerbele) Kalnins for 63 years.

He emgrated to the United States in 1951, where he earned B.S., M.S., and Ph.D. degrees in engineering mechanics from the University of Michigan.

He was a professor emeritus at Lehigh University, and was a professor there for 39 years until he retired in 2004. He was previously on the faculty of the Yale School of Engineering.

He was a member of the Latvian Lutheran Church of Quakertown.

He was a member and fellow of the American Society of Mechanical Engineers and was an internationally recognized expert in the fatigue of metals, particularly the behavior of metal plates and shells. He developed computer programs to analyze shells of revolution that include metal plasticity, free vibration, buckling and creep.

In addition to his wife, he is survived by a son, Arturs T. and his wife Michele Williams of Iowa City, Iowa; two granddaughters, Sarah and Anna Kalnins; and a nephew and nieces in Latvia.

Contributions may be made to Fisher Center for Alzheimer’s Research Foundation, 110 E. 42nd St., 16th floor, New York, N.Y. 10017.

Arrangements were made by Cantelmi Long Funeral Home Inc., Bethlehem.