Kristallphysik II / Crystal Physics II

Advancing towards constitutive equations for the metal industry via the LEDS theory

“…Inserting Eq. [45] yields for just one annihilation mechanism, [51] and on integrating [52] This is the experimentally observed Voce curve of stage III, starting with t ϭ t s at g ϭ g s and asymptotically attaining the maximum stress of t ϭ t s ϩ t j . [45] yields for just one annihilation mechanism, [51] and on integrating [52] This is the experimentally observed Voce curve of stage III, starting with t ϭ t s at g ϭ g s and asymptotically attaining the maximum stress of t ϭ t s ϩ t j .…”

The impact of F.R.N. Nabarro on the LEDS theory of workhardening

“…In the course of years he and his group made immense contributions to our knowledge of crystal plasticity, among others establishing that there were three workhardening stages, probing the effects of workhardening on a variety of physical properties, prominently among them magnetism, and most importantly providing a wealth of information on dislocation structures [22,23]. Parts of Seeger's dislocation pile-up workhardening theory are still lingering in the current ''SODS'' paradigm.…”

“…proponents of pile-ups [22,23,53], critical dislocation bowing [45] and ''forest cutting'' [48]. As a result, Hirsch and Mitchell refined their incisive criticism of Seeger's pile-up theory and expanded Hirsch's stress relieved pile-up theory [24], and I contributed the ''unified'' theory of Stages II and III [54].…”

“…The obstacle option, first introduced by Kochendörfer [11], prevailed as it was somewhat adopted by Orowan under the guidance of Becker [5], next provided the decisive hypothesis in this writer's Ph.D. thesis [9,10], thereafter was adopted from Kochendörfer by his pupil Seeger [22,23], and on to Cottrell, Mott, Hirsch and the majority of materials scientists, to eventually morph into the SODS approach. By contrast the competing paradigm of low-energy dislocation structures, i.e.…”

Effect of carbon black addition and its phase selective distribution on the stress relaxation behavior of filled thermoplastic vulcanizates

“…Although the viscoelastic behavior of the unfilled TPV has been investigated, 7-11 the influence of filler addition and its distribution has not been sufficiently investigated so far. In this work, the two-component model proposed by Seeger,12,13 Krausz and Erying, 14 and Ferry 15 was used to characterize the effect of CB addition on the stress relaxation behavior of TPV by correlating the structural features of TPV compounds and the effect of CB content, type and phase specific distribution on it.…”