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    EFFECT OF TENON GEOMETRY, GRAIN ORIENTATION, AND SHOULDER ON BENDING MOMENT CAPACITY AND MOMENT ROTATION CHARACTERISTICS OF MORTISE AND TENON JOINTS
    (Soc Wood Sci Technol, 2012) Likos, Erkan; Haviarova, Eva; Eckelman, Carl A.; Erdil, Yusuf Ziya; Ozcifci, Ayhan
    Bending moment capacity and moment rotation characteristics of mortise and tenon joints as a function of tenon geometry, grain orientation, length, and shoulder fit were examined. Bending moment capacity of all joints in which tenons were fully inserted in mortises was 54% greater than for joints in which tenons were not fully inserted. Joints with 25.4-mm-long diamond-shaped tenons had greater moment capacity than either rectangular or round tenon joints, whereas joints with 38- or 51-mm-long rectangular tenons had greater capacities than joints with diamond or round tenons. Similarly, for joints in which tenons were not fully inserted, rectangular tenons had the greatest moment capacity regardless of grain orientation or length.
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    TECHNICAL NOTE: STATIC VERSUS CYCLIC LOAD CAPACITY OF SIDE CHAIRS CONSTRUCTED WITH MORTISE AND TENON JOINTS
    (Soc Wood Sci Technol, 2013) Likos, Erkan; Haviarova, Eva; Eckelman, Carl A.; Erdil, Yusuf Ziya; Ozcifci, Ayhan
    The effect of cross-sectional tenon geometry on static and cyclic load capacity of side chairs constructed with round-, rectangular-, and diamond-shaped mortise and tenon joints was investigated. Cyclic load capacity averaged about two-thirds of static load capacity for the joint configurations tested. For the configurations included in the test, chairs with mortise and tenon joints constructed with round-, rectangular-, and diamond-shaped tenons had static load to cyclic passing load ratios of 56.5, 66.8, and 69.2% for rectangular-, round-, and diamond-shaped tenons, respectively. These results indicate that useful relationships existed between static and cyclic performance of round mortise and tenon joints, which may simplify the design process for chairs that must pass cyclic performance tests.