Rotary piercing is a hot working metalworking process for forming thick-walled seamless tubing. There are two types: the Mannesmann process, invented in the 1880s, and the Stiefel …

2009年1月1日 · The paper presents a new model of the Mannesmann effect. The model is based on a novel damage law that takes into account the effects of pre-existing defects in the …

2022年5月18日 · The preparation of nickel-based superalloy tubes by rotary tube piercing (RTP) process is still difficult due to the Mannesmann effect (central cracking phenomenon) has not …

2009年1月1日 · The presence of shrinkage cavities in cast bars contributes to generate the so-called Mannesmann effect, namely a cavity formation along the bar longitudinal axis subjected …

With the hypothesis of rigid-viscoplastic material model we have simulated the Mannesmann piercing process. The model has been developed using our finite element code METFOR …

2007年4月7日 · One of the challenging objectives in studying the Mannesmann piercing process is to predict the fracture initiation, known as “Mannesmann effect”, in order to design and …

The Mannesmann effect (hereafter indicated as ME) refers to the formation of a cavity along the longitudinal axis in bars subjected to radial compression in metalworking operations.

One of the challenging objectives in studying the Mannesmann piercing process is to predict the fracture initiation, known as “Mannesmann effect”, in order to design and optimize the working…

2007年5月17日 · Its special feature is the so‐called Mannesmann effect, that is the cavity formation in the center of the cylindrical billet and its propagation along the axis due to stress …

The Mannesmann effect (ME) pertains to cavity formation in bars subjected to radial compression, impacting processes like rotary tube piercing. This paper proposes a new predictive model that …