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Contact between beams undergoing large displacements can be encountered in many practical applications. Some examples are hydrogen sensors, water supply lines, nuclear power plant piping, cable wires and coils, woven fabrics, and tennis racquet strings. You can model 2-D beam-to-beam contact by using 2-D surface-to-surface contact elements, CONTA171 and CONTA172. (See "Surface-to-Surface Contact" for details on how to use these elements.) You can model 3-D beam-to-beam contact by using the 3-D line-to-line contact element, CONTA176.