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In the position shown in the figure below, the elbow is supported by the biceps and brachialis muscles

Civil Engineering

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In the position shown in the figure below, the elbow is supported by the biceps and brachialis muscles. At this position, the data identifying the location of the insertions and the line of actions of these two muscles are given in the table below. For each of the following two cases: Case 1: Assume that the maximum stresses in the muscle fibers are 75 N/cm?. Case 2: Assume that the maximum stresses in the muscle fibers are 100 N/em'. a) Estimate the forces in these two muscles at this position by minimizing the total muscle stress (sum of the muscle stresses). b) Estimate the value of the joint reaction force at the elbow joint for this position. c) By studying the results of the muscle forces obtained for cases 1 and 2, what can you conclude about linear optimization (5 extra points) Muscle Insertion on Forearm (x, >) Line of Action (from horizontal aris) Muscle Area Biceps cm, 1 cm 120 degrees 4.5 cm Brachialis 5 cm, 1 cm 135 degrees 3.0 em Far Masses: Forearm = 1.6 kg Hand + Ball . 5.5 kg WH + 8 da - 13 em y = 32 cm