Secondary stress. A secondary stress is any stress in the structure which is not a primary stress or peak stress. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards.
Two groups of ground nesting bees commonly. found in Michigan are bumble bees and. burrower (andrenid) bees. Bumble bees are. easily recognized by their large, robust, hairy, black and yellow (sometimes orange) bodies. Bumble bees live in colonies of several. hundred individuals, but only the queens.
Knowing the difference between the two will help you easily identify if you have bees helping around the house â or potentially harming it. The Common Eastern Bumblebee (Bombus Impatiens) is one of the friendlier flying and stinging insects. Known to be both unaggressive and harmless to your home, bumblebees play a very important role in pollination and in the production of honey. Xylocopa virginica, appropriately named the Carpenter Bee, is also a pollinator but known more for its woodworking abilities.