A-20 Havoc in action No 144 by Jim Mesko, Joe Sewell, Don Greer

By Jim Mesko, Joe Sewell, Don Greer

Constructed out of the DB-7 sequence of sunshine bombers. A-20s, Havocs & DB-7s observed motion in virtually each significant theatre of operation in the course of WWII. Used as a mild bomber, flooring strafer & nightfighter. Over a hundred pictures, forty element drawings, three pages of scale drawings, thirteen colour work, 50 pages.

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B) Pitting corrosion on the component; local absence of Ag coating is evident. 5 Wear-Related Failures Material degradation due to mechanical damage is known as wear. Wear is a progressive phenomenon and failures due to wear are generally encountered in the last quarter of the component life. As the material removal under conditions of wear is uniform and damage accumulation is progressive, wear failures are generally predictable. However, if wear damage triggers other modes of failures, catastrophic failures are encountered.

Creep rates are inversely proportional to grain diameter. Directionally solidified structures with dramatically reduced grain boundary areas and single crystals with no high-angle grain boundaries are obviously well suited for creep-resisting applications. • Enhancing the strength of grain boundaries increases the creep strength. Addition of Zr and B to superalloys is known to increase creep resistance. • Precipitation hardening improves creep resistance as the fine, closely spaced, hard and coherent precipitates retard motion of dislocations.

Coarse and nondeformable inclusions such as calcium aluminosilicates are more detrimental than fine and deformable inclusions such as manganese sulphide. • In steels, bainitic structures have higher fatigue life than tempered martensitic structures. • Welding generally decreases fatigue life as a result of weld defects and formation of undesirable phases in the weld metal and HAZ. , influence the fatigue life: • Increasing the mean stress from compressive to tensile reduces fatigue life. • Increasing the stress ratio from negative to positive increases fatigue life.

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