By Sammy Miles
Starting Monday’s agenda at CORROSION 2018, Peter Andresen
presented this year’s Plenary Lecture to a packed house. Peter, formerly with
GE and currently Andresen Consulting, gave insight on his 45-year career. Ninety
percent of his career focused on environmentally-assisted cracking (EAC), and
eighty percent of his work focusing on crack growth rates.
Along with giving an overview of different EAC failures and
a brief history, Peter’s lecture addressed some of the “EAC lore,” and many of
the common assumptions that have been proven untrue. According to Peter, “stress
corrosion cracking (SCC) is more complex than other insidious forms of
corrosion like pitting and crevice corrosion.” Many classic perspectives on SCC
are wrong, Peter said, including immunity and thresholds. Often times,
researchers have been pursuing a single fix for SCC; however, this does not
exist. He indicated that researchers need to consider variables together and
not in isolation, as there are dependencies between all of the variables.
Peter stated people “design by stress, think by stress,” even though there is compelling evidence that it is strain. Additionally, he identified some of the repercussions of accelerated experiments—while much quicker, these studies are less accurate. Peter believes we only know 1% of what there is to know about EAC. He challenged the audience that there was a need to take a different perspective on SCC.