Fundamental deformation types and sectional properties in roll forming

A novel sheet metal forming method—Millipede forming

“…They pointed out that the flange length does not always affect the peak longitudinal strain positively, as after a peak value, the peak longitudinal strain decreases with increase of the flange length. Panton et al (1994Panton et al ( , 1996 proposed that it is possible for there to be no longitudinal strain during roll forming (in which case there would be shear strain) or no shear strain (in which case there would be longitudinal strain). In practice, the strain will lie between these two extremes and will comprise both shear and longitudinal strain.…”

Profile forming of pre-pressed wood-strand preforms

“…However, the greater the recovery, the more compressive deformation should be imparted on the preforms during subsequent profile forming. Due to complex deformations in 3-D profile forming [11], this additional compressive deformation would further complicate the forming process and should be reduced. In this study, thickness recovery of the pre-pressed preform was measured with a laser extensometer (EIR model LE-05).…”

“…For example, four deformation types, including extension or stretching, longitudinal bending, transverse bending, and shear deformation, exist and change continuously in roll forming [11]. These deformations can lead to instabilities in profile forming of continuous fiber reinforced thermoplastic (CFRT) composites.…”

Experimental investigations of the roll load and roll torque when high strength steel is roll formed

“…There are numerous factors which can influence the roll forming design, for example unlimited variation of the shape of the profile. Nevertheless, some researchers have developed simple models [1,2], and in a newly released book Halmos [3] described how this process can be used successfully.…”