41. Therefor bending stiffeners are not required, and round ductwork requires fewer and lighter intermediate stiffeners than rectangular ductwork. 42. Ames downplayed the incident saying that two metal " stiffeners " bent during installation and needed to be replaced. 43. Some berets have a piece of buckram or other stiffener in the position where the badge is intended to be worn. 44. An aluminum-alloy stiffener has been added between the transmission case and the block, just behind the bearing carrier. 45. The " obi " itself often requires the use of stiffeners and ribbons for definition of shape and decoration. 46. Often, each end of the cable is reinforced with a stiffener to make insertion easier or to provide strain relief. 47. It has proven satisfactory in attaching stiffeners , such as hat sections to sheet, and face sheets to honeycomb cores. 48. When stiffener rings are required they are traditionally designed based on " Roark ", although this reference is quite conservative. 49. Analytical solutions obtained in prestressed elasticity show the possibility of the emergence of shear bands at the tip of the stiffener . 50. Double domes use internal stiffeners with wooden struts between the shells, with the exception of those with conical outer shells.
