Early in the morning Thursday October 26, 2006 Samuel K. Clark passed away at the age of 81. “Professor Emeritus Samuel K. Clark, Ph.D., P.E., SAE Fellow” said that anyone who was impressed by such things deserved what they got, which is why he was known to most people as “Sam.”Sam was one of the preeminent tire researchers in the last half of the twentieth century and remained active after retirement working on specialized instrumentation in support of tire science. He will be remembered not only for his research work, but also for his positive influence on his students, consulting clients, and all who worked with him. A generation of tire research and development engineers had Clark's “Mechanics of Pneumatic Tires” as the foundation of their professional libraries. To tire engineers and tire scientists, they are simply known as Clark's Book.Born in Ypsilanti, Michigan, on November 3, 1924 Sam was the son of the late Floyd Clark and Esther Kelly Clark. He grew up in Ypsilanti, and graduated from Roosevelt High School, the teaching school of the former Michigan Normal College. He entered the U.S. Navy V-12 Program in 1942 and was commissioned as a Lieutenant, but did not see active service. Following World War II, he was employed as an engineer with the Douglas Aircraft Company of California and the Ford Motor Company in Dearborn, MI.Professor Clark earned his B.S., M.S., and Ph.D. degrees in engineering from the University of Michigan in 1946, 1948, and 1951, respectively. He married Mary Battelle, an Ypsilanti native, in 1952. In 1968 he and his wife Mary purchased land and designed and built a home in the highlands of Chiapas, Mexico, where they summered and visited frequently until 1998.In 1952, he joined the faculty of Chase Western Reserve University in Cleveland, OH. Then he returned to the University of Michigan, Department of Engineering Mechanics, in 1955 as an assistant professor. He was promoted to associate professor in 1957 and professor in 1959. In addition to his research work, Professor Clark served as director of the undergraduate materials testing laboratory from 1957 to 1978, developed popular courses in composite materials and experimental stress analysis, and was the dynamics course leader. He remained on the faculty as professor of mechanical engineering and applied mechanics until his retirement from active faculty status on May 31, 1992. He continued consulting and research during a retirement sabbatical, then took full retirement from the University in 1994.Like many researchers he came to tires somewhat indirectly. When he arrived at the University of Michigan, he was interested in walking machines. An Akron consortium of tire companies came to the University of Michigan looking for a consultant on tires. The Engineering Mechanics Department suggested they speak to their new faculty member who was interested in transportation mechanics.Professor Clark made seminal research contributions in studies related to aircraft and automotive tires. His research has been sponsored by major rubber, automobile, and aircraft companies as well as by the U.S. Air Force, NASA, NSF, and the Department of Transportation and he authored over 100 journal articles and research reports. Professor Clark was asked to write a book on tire mechanics. In 1971 the U.S. Bureau of Standards published the first edition of “Mechanics of Pneumatic Tires,” which tire engineers relied on for many years for detailed information about the principles of tire design and use. In 1981 a substantially revised second edition was published. With the books long out of print, he served as chair of an Editorial Board composed of leading executives of the tire industry, which provided guidance during the monograph's third revision.He was a founding member of The Tire Society, and Professor Clark was asked to present the plenary lecture at the first meeting of The Tire Society in 1982, and was an Associate Editor of The Journal of Tire Science and Technology until his death. He was also a member of the American Society of Mechanical Engineers, The Society for Experimental Stress Analysis, the National Materials Advisory Board Committee on Surface Effect Vehicles, and The Society of Automotive Engineers. In honor of his many achievements, he was named a fellow of the Society of Automotive Engineers in 1985.Building on his research experience in tire engineering, he started the Precision Measurement Company in 1966, which he continued to actively run with his son Sam until his death. Survivors include his wife, Mary B. Clark, sons Samuel C. of Ann Arbor, Andrew B. of Boston, MA, and Frederic A. Clark of Baraboo, WI. He was preceded in death by two of his children, Elizabeth B. and David H. Clark.Sam Clark was a great person, mentor, and teacher who will be dearly missed by his family, his colleagues, his students, and his friends.
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