Turbine engine shroud segment

Abstract

A turbine engine shroud segment comprises a body including an outer surface away from which an integral attachment system projects. The attachment system comprises a plurality of at least two axially spaced apart circumferentially extending rows of discrete projection hook segments to interrupt a potential hoop stress path through the attachment system. Each projection hook segment includes a segment support surface aligned circumferentially and radially with other segment support surfaces in a row.

1 . A shroud segment, for use in a turbine engine, comprising a body including a body inner surface and a body outer surface spaced apart from the body inner surface, the body extending between spaced apart body first and second axial edge portions and spaced apart body first and second circumferential edge portions, the shroud segment including a plurality of spaced apart projection hooks, for carrying the shroud segment, integral with and projecting away from the body outer surface, each projection hook comprising a hook arm extending away from the body outer surface and a hook end portion extending axially and including a segment support surface of selected support surface shape facing toward the body outer surface, wherein the plurality of projection hooks comprises: 
 at least two axially spaced apart circumferentially extending rows of discrete projection hook segments, each row comprising a plurality of the discrete hook segments spaced apart circumferentially along the body outer surface at least partially between the first and second circumferential edge portions with each hook end portion of each projection hook segment in a row facing toward an axial edge portion; and,    each segment support surface of each projection hook segment is aligned circumferentially and radially with other segment support surfaces in a row.    
   
   
       2 . The shroud segment of  claim 1  in which the shroud segment is made of a low ductility material having a low tensile ductility, measured at room temperature to be no greater than about 1%.  
   
   
       3 . The shroud segment of  claim 1  in which the selected support surface shape is an arc of a circle about an axis of the turbine engine.  
   
   
       4 . The shroud segment of  claim 1  in which the selected support surface shape is planar.  
   
   
       5 . The shroud segment of  claim 1  in which each hook end portion of each of the discrete projection hook segments faces toward the same axial edge portion.  
   
   
       6 . The shroud segment of  claim 5  in which the plurality of projection hooks comprises two axially spaced apart circumferentially extending rows of discrete projection hook segments.  
   
   
       7 . The shroud segment of  claim 5  in which the plurality of projection hooks comprises three axially spaced apart circumferentially extending rows of discrete projection hook segments.  
   
   
       8 . The shroud segment of  claim 1  in which: 
 the plurality of projection hooks comprises at least two axially spaced apart circumferentially extending rows of discrete projection hook segments;    each hook end portion of a first row of discrete projection hook segments facing the second axial edge portion; and,    each hook end portion of a second row of discrete projection hook segments facing the first axial edge portion.